Documentation: Fix typos
Fix typos in Documentation. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Link: https://lore.kernel.org/r/20230814212822.193684-4-helgaas@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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@ -2624,7 +2624,7 @@
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kvm-intel.flexpriority=
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[KVM,Intel] Control KVM's use of FlexPriority feature
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(TPR shadow). Default is 1 (enabled). Disalbe by KVM if
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(TPR shadow). Default is 1 (enabled). Disable by KVM if
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hardware lacks support for it.
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kvm-intel.nested=
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@ -99,7 +99,7 @@ Root
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The root of the DAMON sysfs interface is ``<sysfs>/kernel/mm/damon/``, and it
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has one directory named ``admin``. The directory contains the files for
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privileged user space programs' control of DAMON. User space tools or deamons
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privileged user space programs' control of DAMON. User space tools or daemons
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having the root permission could use this directory.
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kdamonds/
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@ -397,7 +397,7 @@ be used for online analysis or tuning of the schemes.
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The statistics can be retrieved by reading the files under ``stats`` directory
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(``nr_tried``, ``sz_tried``, ``nr_applied``, ``sz_applied``, and
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``qt_exceeds``), respectively. The files are not updated in real time, so you
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should ask DAMON sysfs interface to updte the content of the files for the
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should ask DAMON sysfs interface to update the content of the files for the
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stats by writing a special keyword, ``update_schemes_stats`` to the relevant
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``kdamonds/<N>/state`` file.
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@ -266,7 +266,7 @@ for which it has a public key. Otherwise, it will also load modules that are
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unsigned. Any module for which the kernel has a key, but which proves to have
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a signature mismatch will not be permitted to load.
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Any module that has an unparseable signature will be rejected.
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Any module that has an unparsable signature will be rejected.
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=========================================
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@ -141,7 +141,7 @@ ST506 hard drives
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`*configure` harddrive set to 2). I've got an internal 20MB and a great
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big external 5.25" FH 64MB drive (who could ever want more :-) ).
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I've just got 240K/s off it (a dd with bs=128k); thats about half of what
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I've just got 240K/s off it (a dd with bs=128k); that's about half of what
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RiscOS gets; but it's a heck of a lot better than the 50K/s I was getting
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last week :-)
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@ -78,9 +78,9 @@ IXP4xx provides two methods of accessing PCI memory space:
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1) A direct mapped window from 0x48000000 to 0x4bffffff (64MB).
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To access PCI via this space, we simply ioremap() the BAR
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into the kernel and we can use the standard read[bwl]/write[bwl]
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macros. This is the preffered method due to speed but it
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macros. This is the preferred method due to speed but it
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limits the system to just 64MB of PCI memory. This can be
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problamatic if using video cards and other memory-heavy devices.
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problematic if using video cards and other memory-heavy devices.
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2) If > 64MB of memory space is required, the IXP4xx can be
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configured to use indirect registers to access PCI This allows
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@ -5,7 +5,7 @@ Frequently asked questions about the sunxi clock system
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This document contains useful bits of information that people tend to ask
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about the sunxi clock system, as well as accompanying ASCII art when adequate.
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Q: Why is the main 24MHz oscillator gatable? Wouldn't that break the
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Q: Why is the main 24MHz oscillator gateable? Wouldn't that break the
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system?
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A: The 24MHz oscillator allows gating to save power. Indeed, if gated
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@ -1,7 +1,7 @@
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Software emulation of deprecated SWP instruction (CONFIG_SWP_EMULATE)
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---------------------------------------------------------------------
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ARMv6 architecture deprecates use of the SWP/SWPB instructions, and recommeds
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ARMv6 architecture deprecates use of the SWP/SWPB instructions, and recommends
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moving to the load-locked/store-conditional instructions LDREX and STREX.
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ARMv7 multiprocessing extensions introduce the ability to disable these
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@ -71,7 +71,7 @@ in <asm/tcm.h>. Using this interface it is possible to:
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- Have the remaining TCM RAM added to a special
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allocation pool with gen_pool_create() and gen_pool_add()
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and provice tcm_alloc() and tcm_free() for this
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and provide tcm_alloc() and tcm_free() for this
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memory. Such a heap is great for things like saving
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device state when shutting off device power domains.
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@ -155,7 +155,7 @@ the basic algorithm:
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optimisation.
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If there are too many CPUs to read the currently_voting array in
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one transaction then multiple transations are still required. The
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one transaction then multiple transactions are still required. The
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implementation uses a simple loop of word-sized loads for this
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case. The number of transactions is still fewer than would be
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required if bytes were loaded individually.
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@ -45,7 +45,7 @@ APMT Signature Reserved (signature == "APMT")
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**Arm Performance Monitoring Table**
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This table describes the properties of PMU support implmented by
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This table describes the properties of PMU support implemented by
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components in the system.
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BERT Section 18.3 (signature == "BERT")
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@ -99,7 +99,7 @@ to replace the kernel.
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When a Linux driver or subsystem is first implemented using ACPI, it by
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definition ends up requiring a specific version of the ACPI specification
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-- it's baseline. ACPI firmware must continue to work, even though it may
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-- its baseline. ACPI firmware must continue to work, even though it may
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not be optimal, with the earliest kernel version that first provides support
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for that baseline version of ACPI. There may be a need for additional drivers,
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but adding new functionality (e.g., CPU power management) should not break
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@ -114,7 +114,7 @@ History
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port to 2.6.x
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30-11-2004 Matjaz Breskvar (phoenix@bsemi.com)
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lots of bugfixes and enhancments.
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lots of bugfixes and enhancements.
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added opencores framebuffer driver.
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09-10-2010 Jonas Bonn (jonas@southpole.se)
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@ -1105,7 +1105,7 @@ The kernel command line should not be located below the real-mode
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code, nor should it be located in high memory.
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Sample Boot Configuartion
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Sample Boot Configuration
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=========================
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As a sample configuration, assume the following layout of the real
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@ -32,7 +32,7 @@ mechanisms to detect split locks and bus locks.
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--------------------------------------
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Beginning with the Tremont Atom CPU split lock operations may raise an
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Alignment Check (#AC) exception when a split lock operation is attemped.
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Alignment Check (#AC) exception when a split lock operation is attempted.
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#DB exception for bus lock detection
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------------------------------------
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@ -60,7 +60,7 @@ needed for exploiting MDS requires:
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data
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The existence of such a construct in the kernel cannot be excluded with
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100% certainty, but the complexity involved makes it extremly unlikely.
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100% certainty, but the complexity involved makes it extremely unlikely.
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There is one exception, which is untrusted BPF. The functionality of
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untrusted BPF is limited, but it needs to be thoroughly investigated
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@ -245,7 +245,7 @@ SGX will likely become unusable because the memory available to SGX is
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limited. However, while this may be fatal to SGX, the rest of the kernel
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is unlikely to be impacted and should continue to work.
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As a result, when this happpens, user should stop running any new
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As a result, when this happens, user should stop running any new
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SGX workloads, (or just any new workloads), and migrate all valuable
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workloads. Although a machine reboot can recover all EPC memory, the bug
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should be reported to Linux developers.
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@ -23,7 +23,7 @@ doing a Cached (WB) transaction and use the Memory RCW for un-cached
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operations.
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For systems without an coherent cache controller, non-MX, we always
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use the memory controllers RCW, thought non-MX controlers likely
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use the memory controllers RCW, though non-MX controllers likely
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support the Internal Operation.
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CUSTOMER-WARNING:
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@ -209,7 +209,7 @@ will require extra work due to the application tag.
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sector must be set, and the bio should have all data pages
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added. It is up to the caller to ensure that the bio does not
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change while I/O is in progress.
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Complete bio with error if prepare failed for some reson.
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Complete bio with error if prepare failed for some reason.
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5.3 Passing Existing Integrity Metadata
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@ -238,7 +238,7 @@ The's IO is assigned by a unique tag, which is 1:1 mapping with IO
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request of ``/dev/ublkb*``.
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UAPI structure of ``ublksrv_io_desc`` is defined for describing each IO from
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the driver. A fixed mmaped area (array) on ``/dev/ublkc*`` is provided for
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the driver. A fixed mmapped area (array) on ``/dev/ublkc*`` is provided for
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exporting IO info to the server; such as IO offset, length, OP/flags and
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buffer address. Each ``ublksrv_io_desc`` instance can be indexed via queue id
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and IO tag directly.
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@ -364,7 +364,7 @@ can be used to query the contents of cpumasks.
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----
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Some example usages of these querying kfuncs were shown above. We will not
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replicate those exmaples here. Note, however, that all of the aforementioned
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replicate those examples here. Note, however, that all of the aforementioned
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kfuncs are tested in `tools/testing/selftests/bpf/progs/cpumask_success.c`_, so
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please take a look there if you're looking for more examples of how they can be
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used.
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@ -23,7 +23,7 @@ Introduction
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The BPF map API has historically been the main way to expose data structures
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of various types for use within BPF programs. Some data structures fit naturally
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with the map API (HASH, ARRAY), others less so. Consequentially, programs
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with the map API (HASH, ARRAY), others less so. Consequently, programs
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interacting with the latter group of data structures can be hard to parse
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for kernel programmers without previous BPF experience.
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@ -243,7 +243,7 @@ proc entries
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Error Injectable Functions
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--------------------------
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This part is for the kenrel developers considering to add a function to
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This part is for the kernel developers considering to add a function to
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ALLOW_ERROR_INJECTION() macro.
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Requirements for the Error Injectable Functions
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@ -9,7 +9,7 @@ works:
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- userspace app like Xfbdev mmaps framebuffer
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- deferred IO and driver sets up fault and page_mkwrite handlers
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- userspace app tries to write to mmaped vaddress
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- userspace app tries to write to mmapped vaddress
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- we get pagefault and reach fault handler
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- fault handler finds and returns physical page
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- we get page_mkwrite where we add this page to a list
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@ -31,5 +31,5 @@ Missing Features
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================
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(alias TODO list)
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* 2D acceleratrion
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* 2D acceleration
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* dual-head support
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@ -73,7 +73,7 @@ Module insertion
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the device will be /dev/fb0. You can check this by doing a
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cat /proc/fb. You can find a copy of con2fb in tools/ directory.
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if you don't have another fb device, this step is superfluous,
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as the console subsystem automagicaly binds ttys to the fb.
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as the console subsystem automagically binds ttys to the fb.
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#. switch to the virtual console you just mapped. "tadaaa" ...
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Module removal
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@ -1,7 +1,7 @@
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#
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# Feature name: thread-info-in-task
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# Kconfig: THREAD_INFO_IN_TASK
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# description: arch makes use of the core kernel facility to embedd thread_info in task_struct
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# description: arch makes use of the core kernel facility to embed thread_info in task_struct
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#
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-----------------------
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| arch |status|
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@ -79,7 +79,7 @@ Options
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cache=mode specifies a caching policy. By default, no caches are used.
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The mode can be specified as a bitmask or by using one of the
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prexisting common 'shortcuts'.
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preexisting common 'shortcuts'.
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The bitmask is described below: (unspecified bits are reserved)
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========== ====================================================
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@ -106,8 +106,8 @@ iocharset=xxx Use xxx as the name of the NLS translation table.
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debug The driver will output debugging information to the syslog.
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============= ===========================================================
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How to Get Lastest Version
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==========================
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How to Get Latest Version
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=========================
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The latest version is currently available at:
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<http://befs-driver.sourceforge.net/>
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@ -416,7 +416,7 @@ process is the target of an operation by some other process (SIGKILL for
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example).
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The subjective security holds the active security properties of a process, and
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may be overridden. This is not seen externally, and is used whan a process
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may be overridden. This is not seen externally, and is used when a process
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acts upon another object, for example SIGKILLing another process or opening a
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file.
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@ -59,7 +59,7 @@ A filesystem would typically have a volume cookie for each superblock.
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The filesystem then acquires a cookie for each file within that volume using an
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object key. Object keys are binary blobs and only need to be unique within
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their parent volume. The cache backend is reponsible for rendering the binary
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their parent volume. The cache backend is responsible for rendering the binary
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blob into something it can use and may employ hash tables, trees or whatever to
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improve its ability to find an object. This is transparent to the network
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filesystem.
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@ -91,7 +91,7 @@ actually required and it can use the fscache I/O API directly.
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Volume Registration
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===================
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The first step for a network filsystem is to acquire a volume cookie for the
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The first step for a network filesystem is to acquire a volume cookie for the
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volume it wants to access::
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struct fscache_volume *
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@ -119,7 +119,7 @@ is provided. If the coherency data doesn't match, the entire cache volume will
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be invalidated.
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This function can return errors such as EBUSY if the volume key is already in
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use by an acquired volume or ENOMEM if an allocation failure occured. It may
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use by an acquired volume or ENOMEM if an allocation failure occurred. It may
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also return a NULL volume cookie if fscache is not enabled. It is safe to
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pass a NULL cookie to any function that takes a volume cookie. This will
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cause that function to do nothing.
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@ -253,7 +253,7 @@ to be used.
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If binary attribute is readable and the config_item provides a
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ct_item_ops->read_bin_attribute() method, that method will be called
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whenever userspace asks for a read(2) on the attribute. The converse
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will happen for write(2). The reads/writes are bufferred so only a
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will happen for write(2). The reads/writes are buffered so only a
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single read/write will occur; the attributes' need not concern itself
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with it.
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@ -291,7 +291,7 @@ The DAX code does not work correctly on architectures which have virtually
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mapped caches such as ARM, MIPS and SPARC.
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Calling :c:func:`get_user_pages()` on a range of user memory that has been
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mmaped from a `DAX` file will fail when there are no 'struct page' to describe
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mmapped from a `DAX` file will fail when there are no 'struct page' to describe
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those pages. This problem has been addressed in some device drivers
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by adding optional struct page support for pages under the control of
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the driver (see `CONFIG_NVDIMM_PFN` in ``drivers/nvdimm`` for an example of
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@ -5,8 +5,8 @@ The Devpts Filesystem
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=====================
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Each mount of the devpts filesystem is now distinct such that ptys
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and their indicies allocated in one mount are independent from ptys
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and their indicies in all other mounts.
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and their indices allocated in one mount are independent from ptys
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and their indices in all other mounts.
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All mounts of the devpts filesystem now create a ``/dev/pts/ptmx`` node
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with permissions ``0000``.
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@ -772,7 +772,7 @@ The ``s_default_mount_opts`` field is any combination of the following:
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* - 0x0010
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- Do not support 32-bit UIDs. (EXT4_DEFM_UID16)
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* - 0x0020
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- All data and metadata are commited to the journal.
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- All data and metadata are committed to the journal.
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(EXT4_DEFM_JMODE_DATA)
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* - 0x0040
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- All data are flushed to the disk before metadata are committed to the
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@ -359,7 +359,7 @@ errors=%s Specify f2fs behavior on critical errors. This supports modes:
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====================== =============== =============== ========
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mode continue remount-ro panic
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====================== =============== =============== ========
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access ops normal noraml N/A
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access ops normal normal N/A
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syscall errors -EIO -EROFS N/A
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mount option rw ro N/A
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pending dir write keep keep N/A
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@ -480,7 +480,7 @@ Note: please refer to the manpage of dump.f2fs(8) to get full option list.
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sload.f2fs
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----------
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The sload.f2fs gives a way to insert files and directories in the exisiting disk
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The sload.f2fs gives a way to insert files and directories in the existing disk
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image. This tool is useful when building f2fs images given compiled files.
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Note: please refer to the manpage of sload.f2fs(8) to get full option list.
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@ -792,7 +792,7 @@ Allocating disk space
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as a method of optimally implementing that function.
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However, once F2FS receives ioctl(fd, F2FS_IOC_SET_PIN_FILE) in prior to
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fallocate(fd, DEFAULT_MODE), it allocates on-disk block addressess having
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fallocate(fd, DEFAULT_MODE), it allocates on-disk block addresses having
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zero or random data, which is useful to the below scenario where:
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1. create(fd)
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|
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@ -78,7 +78,7 @@ The minimum hold time for each lock is the time after a remote lock
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grant for which we ignore remote demote requests. This is in order to
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prevent a situation where locks are being bounced around the cluster
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from node to node with none of the nodes making any progress. This
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tends to show up most with shared mmaped files which are being written
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tends to show up most with shared mmapped files which are being written
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to by multiple nodes. By delaying the demotion in response to a
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remote callback, that gives the userspace program time to make
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some progress before the pages are unmapped.
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@ -36,7 +36,7 @@ and write down the mappings it will generate::
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From a mathematical viewpoint ``U`` and ``K`` are well-ordered sets and an
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idmapping is an order isomorphism from ``U`` into ``K``. So ``U`` and ``K`` are
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order isomorphic. In fact, ``U`` and ``K`` are always well-ordered subsets of
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the set of all possible ids useable on a given system.
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the set of all possible ids usable on a given system.
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Looking at this mathematically briefly will help us highlight some properties
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that make it easier to understand how we can translate between idmappings. For
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@ -47,7 +47,7 @@ example, we know that the inverse idmapping is an order isomorphism as well::
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k10002 -> u24
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Given that we are dealing with order isomorphisms plus the fact that we're
|
||||
dealing with subsets we can embedd idmappings into each other, i.e. we can
|
||||
dealing with subsets we can embed idmappings into each other, i.e. we can
|
||||
sensibly translate between different idmappings. For example, assume we've been
|
||||
given the three idmappings::
|
||||
|
||||
|
@ -60,7 +60,7 @@ and id ``k11000`` which has been generated by the first idmapping by mapping
|
|||
|
||||
Because we're dealing with order isomorphic subsets it is meaningful to ask
|
||||
what id ``k11000`` corresponds to in the second or third idmapping. The
|
||||
straightfoward algorithm to use is to apply the inverse of the first idmapping,
|
||||
straightforward algorithm to use is to apply the inverse of the first idmapping,
|
||||
mapping ``k11000`` up to ``u1000``. Afterwards, we can map ``u1000`` down using
|
||||
either the second idmapping mapping or third idmapping mapping. The second
|
||||
idmapping would map ``u1000`` down to ``21000``. The third idmapping would map
|
||||
|
@ -367,7 +367,7 @@ So with the second step the kernel guarantees that a valid userspace id can be
|
|||
written to disk. If it can't the kernel will refuse the creation request to not
|
||||
even remotely risk filesystem corruption.
|
||||
|
||||
The astute reader will have realized that this is simply a varation of the
|
||||
The astute reader will have realized that this is simply a variation of the
|
||||
crossmapping algorithm we mentioned above in a previous section. First, the
|
||||
kernel maps the caller's userspace id down into a kernel id according to the
|
||||
caller's idmapping and then maps that kernel id up according to the
|
||||
|
@ -458,7 +458,7 @@ the kernel id that was created in the caller's idmapping. This has mainly two
|
|||
consequences.
|
||||
|
||||
First, that we can't allow a caller to ultimately write to disk with another
|
||||
userspace id. We could only do this if we were to mount the whole fileystem
|
||||
userspace id. We could only do this if we were to mount the whole filesystem
|
||||
with the caller's or another idmapping. But that solution is limited to a few
|
||||
filesystems and not very flexible. But this is a use-case that is pretty
|
||||
important in containerized workloads.
|
||||
|
@ -662,7 +662,7 @@ use the ``vfsuid_into_kuid()`` and ``vfsgid_into_kgid()`` helpers.
|
|||
To illustrate why this helper currently exists, consider what happens when we
|
||||
change ownership of an inode from an idmapped mount. After we generated
|
||||
a ``vfsuid_t`` or ``vfsgid_t`` based on the mount idmapping we later commit to
|
||||
this ``vfsuid_t`` or ``vfsgid_t`` to become the new filesytem wide ownership.
|
||||
this ``vfsuid_t`` or ``vfsgid_t`` to become the new filesystem wide ownership.
|
||||
Thus, we are turning the ``vfsuid_t`` or ``vfsgid_t`` into a global ``kuid_t``
|
||||
or ``kgid_t``. And this can be done by using ``vfsuid_into_kuid()`` and
|
||||
``vfsgid_into_kgid()``.
|
||||
|
|
|
@ -155,7 +155,7 @@ conflicting writes or track dirty data and needs to put the acquired folio if
|
|||
an error occurs after calling the helper.
|
||||
|
||||
The helpers manage the read request, calling back into the network filesystem
|
||||
through the suppplied table of operations. Waits will be performed as
|
||||
through the supplied table of operations. Waits will be performed as
|
||||
necessary before returning for helpers that are meant to be synchronous.
|
||||
|
||||
If an error occurs, the ->free_request() will be called to clean up the
|
||||
|
|
|
@ -131,7 +131,7 @@ deployments, this construction is usually adequate. Often, however,
|
|||
the node name by itself is not adequately unique, and can change
|
||||
unexpectedly. Problematic situations include:
|
||||
|
||||
- NFS-root (diskless) clients, where the local DCHP server (or
|
||||
- NFS-root (diskless) clients, where the local DHCP server (or
|
||||
equivalent) does not provide a unique host name.
|
||||
|
||||
- "Containers" within a single Linux host. If each container has
|
||||
|
|
|
@ -78,7 +78,7 @@ Creating a Cache
|
|||
include taking references to shared objects.
|
||||
|
||||
void update(struct cache_head \*orig, struct cache_head \*new)
|
||||
Set the 'content' fileds in 'new' from 'orig'.
|
||||
Set the 'content' fields in 'new' from 'orig'.
|
||||
|
||||
int cache_show(struct seq_file \*m, struct cache_detail \*cd, struct cache_head \*h)
|
||||
Optional. Used to provide a /proc file that lists the
|
||||
|
|
|
@ -29,7 +29,7 @@ The Linux kernel, at the moment, supports only the KRB5 mechanism, and
|
|||
depends on GSSAPI extensions that are KRB5 specific.
|
||||
|
||||
GSSAPI is a complex library, and implementing it completely in kernel is
|
||||
unwarranted. However GSSAPI operations are fundementally separable in 2
|
||||
unwarranted. However GSSAPI operations are fundamentally separable in 2
|
||||
parts:
|
||||
|
||||
- initial context establishment
|
||||
|
|
|
@ -231,7 +231,7 @@ file structures (nilfs_finfo), and per block structures (nilfs_binfo)::
|
|||
|
||||
|
||||
The logs include regular files, directory files, symbolic link files
|
||||
and several meta data files. The mata data files are the files used
|
||||
and several meta data files. The meta data files are the files used
|
||||
to maintain file system meta data. The current version of NILFS2 uses
|
||||
the following meta data files::
|
||||
|
||||
|
|
|
@ -112,7 +112,7 @@ this table marked with no it means default is without **no**.
|
|||
Todo list
|
||||
=========
|
||||
- Full journaling support over JBD. Currently journal replaying is supported
|
||||
which is not necessarily as effectice as JBD would be.
|
||||
which is not necessarily as effective as JBD would be.
|
||||
|
||||
References
|
||||
==========
|
||||
|
|
|
@ -274,7 +274,7 @@ then contains:
|
|||
of kcalloced memory. This memory is used as an array of pointers
|
||||
to each of the pages in the IO buffer through a call to get_user_pages.
|
||||
* desc_array - a pointer to ``desc_count * (sizeof(struct orangefs_bufmap_desc))``
|
||||
bytes of kcalloced memory. This memory is further intialized:
|
||||
bytes of kcalloced memory. This memory is further initialized:
|
||||
|
||||
user_desc is the kernel's copy of the IO buffer's ORANGEFS_dev_map_desc
|
||||
structure. user_desc->ptr points to the IO buffer.
|
||||
|
|
|
@ -195,7 +195,7 @@ handle it in two different ways:
|
|||
|
||||
1. return EXDEV error: this error is returned by rename(2) when trying to
|
||||
move a file or directory across filesystem boundaries. Hence
|
||||
applications are usually prepared to hande this error (mv(1) for example
|
||||
applications are usually prepared to handle this error (mv(1) for example
|
||||
recursively copies the directory tree). This is the default behavior.
|
||||
|
||||
2. If the "redirect_dir" feature is enabled, then the directory will be
|
||||
|
@ -235,7 +235,7 @@ Mount options:
|
|||
Redirects are not created and not followed.
|
||||
- "redirect_dir=off":
|
||||
If "redirect_always_follow" is enabled in the kernel/module config,
|
||||
this "off" traslates to "follow", otherwise it translates to "nofollow".
|
||||
this "off" translates to "follow", otherwise it translates to "nofollow".
|
||||
|
||||
When the NFS export feature is enabled, every copied up directory is
|
||||
indexed by the file handle of the lower inode and a file handle of the
|
||||
|
|
|
@ -177,7 +177,7 @@ settles down a bit.
|
|||
**mandatory**
|
||||
|
||||
s_export_op is now required for exporting a filesystem.
|
||||
isofs, ext2, ext3, resierfs, fat
|
||||
isofs, ext2, ext3, reiserfs, fat
|
||||
can be used as examples of very different filesystems.
|
||||
|
||||
---
|
||||
|
@ -470,7 +470,7 @@ has been taken to VFS and filesystems need to provide a non-NULL
|
|||
**mandatory**
|
||||
|
||||
If you implement your own ->llseek() you must handle SEEK_HOLE and
|
||||
SEEK_DATA. You can hanle this by returning -EINVAL, but it would be nicer to
|
||||
SEEK_DATA. You can handle this by returning -EINVAL, but it would be nicer to
|
||||
support it in some way. The generic handler assumes that the entire file is
|
||||
data and there is a virtual hole at the end of the file. So if the provided
|
||||
offset is less than i_size and SEEK_DATA is specified, return the same offset.
|
||||
|
@ -517,7 +517,7 @@ The witch is dead! Well, 2/3 of it, anyway. ->d_revalidate() and
|
|||
|
||||
->create() doesn't take ``struct nameidata *``; unlike the previous
|
||||
two, it gets "is it an O_EXCL or equivalent?" boolean argument. Note that
|
||||
local filesystems can ignore tha argument - they are guaranteed that the
|
||||
local filesystems can ignore this argument - they are guaranteed that the
|
||||
object doesn't exist. It's remote/distributed ones that might care...
|
||||
|
||||
---
|
||||
|
|
|
@ -507,12 +507,12 @@ pressure if the memory is clean. Please note that the printed value might
|
|||
be lower than the real value due to optimizations used in the current
|
||||
implementation. If this is not desirable please file a bug report.
|
||||
|
||||
"AnonHugePages" shows the ammount of memory backed by transparent hugepage.
|
||||
"AnonHugePages" shows the amount of memory backed by transparent hugepage.
|
||||
|
||||
"ShmemPmdMapped" shows the ammount of shared (shmem/tmpfs) memory backed by
|
||||
"ShmemPmdMapped" shows the amount of shared (shmem/tmpfs) memory backed by
|
||||
huge pages.
|
||||
|
||||
"Shared_Hugetlb" and "Private_Hugetlb" show the ammounts of memory backed by
|
||||
"Shared_Hugetlb" and "Private_Hugetlb" show the amounts of memory backed by
|
||||
hugetlbfs page which is *not* counted in "RSS" or "PSS" field for historical
|
||||
reasons. And these are not included in {Shared,Private}_{Clean,Dirty} field.
|
||||
|
||||
|
@ -561,7 +561,7 @@ encoded manner. The codes are the following:
|
|||
mm mixed map area
|
||||
hg huge page advise flag
|
||||
nh no huge page advise flag
|
||||
mg mergable advise flag
|
||||
mg mergeable advise flag
|
||||
bt arm64 BTI guarded page
|
||||
mt arm64 MTE allocation tags are enabled
|
||||
um userfaultfd missing tracking
|
||||
|
@ -1081,7 +1081,7 @@ Writeback
|
|||
AnonPages
|
||||
Non-file backed pages mapped into userspace page tables
|
||||
Mapped
|
||||
files which have been mmaped, such as libraries
|
||||
files which have been mmapped, such as libraries
|
||||
Shmem
|
||||
Total memory used by shared memory (shmem) and tmpfs
|
||||
KReclaimable
|
||||
|
@ -2229,7 +2229,7 @@ are not related to tasks.
|
|||
Chapter 5: Filesystem behavior
|
||||
==============================
|
||||
|
||||
Originally, before the advent of pid namepsace, procfs was a global file
|
||||
Originally, before the advent of pid namespace, procfs was a global file
|
||||
system. It means that there was only one procfs instance in the system.
|
||||
|
||||
When pid namespace was added, a separate procfs instance was mounted in
|
||||
|
|
|
@ -135,7 +135,7 @@ inode.
|
|||
|
||||
Character and block special devices do not exist in QNX as those files
|
||||
are handled by the QNX kernel/drivers and created in /dev independent of the
|
||||
underlaying filesystem.
|
||||
underlying filesystem.
|
||||
|
||||
Long filenames
|
||||
--------------
|
||||
|
|
|
@ -130,7 +130,7 @@ called SEQ_START_TOKEN; it can be used if you wish to instruct your
|
|||
show() function (described below) to print a header at the top of the
|
||||
output. SEQ_START_TOKEN should only be used if the offset is zero,
|
||||
however. SEQ_START_TOKEN has no special meaning to the core seq_file
|
||||
code. It is provided as a convenience for a start() funciton to
|
||||
code. It is provided as a convenience for a start() function to
|
||||
communicate with the next() and show() functions.
|
||||
|
||||
The next function to implement is called, amazingly, next(); its job is to
|
||||
|
@ -217,7 +217,7 @@ between the calls to start() and stop(), so holding a lock during that time
|
|||
is a reasonable thing to do. The seq_file code will also avoid taking any
|
||||
other locks while the iterator is active.
|
||||
|
||||
The iterater value returned by start() or next() is guaranteed to be
|
||||
The iterator value returned by start() or next() is guaranteed to be
|
||||
passed to a subsequent next() or stop() call. This allows resources
|
||||
such as locks that were taken to be reliably released. There is *no*
|
||||
guarantee that the iterator will be passed to show(), though in practice
|
||||
|
|
|
@ -130,7 +130,7 @@ marked as dirty are written to the flash to update the persisted index.
|
|||
Journal
|
||||
~~~~~~~
|
||||
|
||||
To avoid wearing out the flash, the index is only persisted (*commited*) when
|
||||
To avoid wearing out the flash, the index is only persisted (*committed*) when
|
||||
certain conditions are met (eg. ``fsync(2)``). The journal is used to record
|
||||
any changes (in form of inode nodes, data nodes etc.) between commits
|
||||
of the index. During mount, the journal is read from the flash and replayed
|
||||
|
|
|
@ -50,7 +50,7 @@ VFAT MOUNT OPTIONS
|
|||
Normally utime(2) checks current process is owner of
|
||||
the file, or it has CAP_FOWNER capability. But FAT
|
||||
filesystem doesn't have uid/gid on disk, so normal
|
||||
check is too unflexible. With this option you can
|
||||
check is too inflexible. With this option you can
|
||||
relax it.
|
||||
|
||||
**codepage=###**
|
||||
|
|
|
@ -761,7 +761,7 @@ is an error during writeback, they expect that error to be reported when
|
|||
a file sync request is made. After an error has been reported on one
|
||||
request, subsequent requests on the same file descriptor should return
|
||||
0, unless further writeback errors have occurred since the previous file
|
||||
syncronization.
|
||||
synchronization.
|
||||
|
||||
Ideally, the kernel would report errors only on file descriptions on
|
||||
which writes were done that subsequently failed to be written back. The
|
||||
|
|
|
@ -293,7 +293,7 @@ The seven phases are as follows:
|
|||
Before starting repairs, the summary counters are checked and any necessary
|
||||
repairs are performed so that subsequent repairs will not fail the resource
|
||||
reservation step due to wildly incorrect summary counters.
|
||||
Unsuccesful repairs are requeued as long as forward progress on repairs is
|
||||
Unsuccessful repairs are requeued as long as forward progress on repairs is
|
||||
made somewhere in the filesystem.
|
||||
Free space in the filesystem is trimmed at the end of phase 4 if the
|
||||
filesystem is clean.
|
||||
|
@ -542,7 +542,7 @@ ondisk structure.
|
|||
|
||||
Inspiration for quota and file link count repair strategies were drawn from
|
||||
sections 2.12 ("Online Index Operations") through 2.14 ("Incremental View
|
||||
Maintenace") of G. Graefe, `"Concurrent Queries and Updates in Summary Views
|
||||
Maintenance") of G. Graefe, `"Concurrent Queries and Updates in Summary Views
|
||||
and Their Indexes"
|
||||
<http://www.odbms.org/wp-content/uploads/2014/06/Increment-locks.pdf>`_, 2011.
|
||||
|
||||
|
@ -605,7 +605,7 @@ functionality.
|
|||
The cron job does not have this protection.
|
||||
|
||||
- **Fuzz Kiddiez**: There are many people now who seem to think that running
|
||||
automated fuzz testing of ondisk artifacts to find mischevious behavior and
|
||||
automated fuzz testing of ondisk artifacts to find mischievous behavior and
|
||||
spraying exploit code onto the public mailing list for instant zero-day
|
||||
disclosure is somehow of some social benefit.
|
||||
In the view of this author, the benefit is realized only when the fuzz
|
||||
|
@ -1351,7 +1351,7 @@ If the leaf information exceeds a single filesystem block, a dabtree (also
|
|||
rooted at block 0) is created to map hashes of the attribute names to leaf
|
||||
blocks in the attr fork.
|
||||
|
||||
Checking an extended attribute structure is not so straightfoward due to the
|
||||
Checking an extended attribute structure is not so straightforward due to the
|
||||
lack of separation between attr blocks and index blocks.
|
||||
Scrub must read each block mapped by the attr fork and ignore the non-leaf
|
||||
blocks:
|
||||
|
@ -1401,7 +1401,7 @@ If the free space has been separated and the second partition grows again
|
|||
beyond one block, then a dabtree is used to map hashes of dirent names to
|
||||
directory data blocks.
|
||||
|
||||
Checking a directory is pretty straightfoward:
|
||||
Checking a directory is pretty straightforward:
|
||||
|
||||
1. Walk the dabtree in the second partition (if present) to ensure that there
|
||||
are no irregularities in the blocks or dabtree mappings that do not point to
|
||||
|
@ -1524,7 +1524,7 @@ Only online fsck has this requirement of total consistency of AG metadata, and
|
|||
should be relatively rare as compared to filesystem change operations.
|
||||
Online fsck coordinates with transaction chains as follows:
|
||||
|
||||
* For each AG, maintain a count of intent items targetting that AG.
|
||||
* For each AG, maintain a count of intent items targeting that AG.
|
||||
The count should be bumped whenever a new item is added to the chain.
|
||||
The count should be dropped when the filesystem has locked the AG header
|
||||
buffers and finished the work.
|
||||
|
@ -2102,7 +2102,7 @@ quicksort and a heapsort subalgorithm in the spirit of
|
|||
kernel.
|
||||
To sort records in a reasonably short amount of time, ``xfarray`` takes
|
||||
advantage of the binary subpartitioning offered by quicksort, but it also uses
|
||||
heapsort to hedge aginst performance collapse if the chosen quicksort pivots
|
||||
heapsort to hedge against performance collapse if the chosen quicksort pivots
|
||||
are poor.
|
||||
Both algorithms are (in general) O(n * lg(n)), but there is a wide performance
|
||||
gulf between the two implementations.
|
||||
|
@ -2566,8 +2566,8 @@ old metadata blocks:
|
|||
The transaction rolling in steps 2c and 3 represent a weakness in the repair
|
||||
algorithm, because a log flush and a crash before the end of the reap step can
|
||||
result in space leaking.
|
||||
Online repair functions minimize the chances of this occuring by using very
|
||||
large transactions, which each can accomodate many thousands of block freeing
|
||||
Online repair functions minimize the chances of this occurring by using very
|
||||
large transactions, which each can accommodate many thousands of block freeing
|
||||
instructions.
|
||||
Repair moves on to reaping the old blocks, which will be presented in a
|
||||
subsequent :ref:`section<reaping>` after a few case studies of bulk loading.
|
||||
|
@ -5090,7 +5090,7 @@ This scan after validation of all filesystem metadata (except for the summary
|
|||
counters) as phase 6.
|
||||
The scan starts by calling ``FS_IOC_GETFSMAP`` to scan the filesystem space map
|
||||
to find areas that are allocated to file data fork extents.
|
||||
Gaps betweeen data fork extents that are smaller than 64k are treated as if
|
||||
Gaps between data fork extents that are smaller than 64k are treated as if
|
||||
they were data fork extents to reduce the command setup overhead.
|
||||
When the space map scan accumulates a region larger than 32MB, a media
|
||||
verification request is sent to the disk as a directio read of the raw block
|
||||
|
|
|
@ -378,7 +378,7 @@ The attributes defined are as follows.
|
|||
sequential zone files. Failure to do so can result in write errors.
|
||||
* **max_active_seq_files**: This attribute reports the maximum number of
|
||||
sequential zone files that are in an active state, that is, sequential zone
|
||||
files that are partially writen (not empty nor full) or that have a zone that
|
||||
files that are partially written (not empty nor full) or that have a zone that
|
||||
is explicitly open (which happens only if the *explicit-open* mount option is
|
||||
used). This number is always equal to the maximum number of active zones that
|
||||
the device supports. A value of 0 means that the mounted device has no limit
|
||||
|
|
|
@ -55,7 +55,7 @@ quirk, a bug, or a bug-fix.
|
|||
|
||||
However this was discovered to be abused by other BIOS vendors to change
|
||||
completely unrelated code on completely unrelated systems. This prompted
|
||||
an evaluation of all of it's uses. This uncovered that they aren't needed
|
||||
an evaluation of all of its uses. This uncovered that they aren't needed
|
||||
for any of the original reasons. As such, the kernel will not respond to
|
||||
any custom Linux-* strings by default.
|
||||
|
||||
|
|
|
@ -178,7 +178,7 @@ Multiple Display MPO
|
|||
|
||||
AMDGPU supports display MPO when using multiple displays; however, this feature
|
||||
behavior heavily relies on the compositor implementation. Keep in mind that
|
||||
usespace can define different policies. For example, some OSes can use MPO to
|
||||
userspace can define different policies. For example, some OSes can use MPO to
|
||||
protect the plane that handles the video playback; notice that we don't have
|
||||
many limitations for a single display. Nonetheless, this manipulation can have
|
||||
many more restrictions for a multi-display scenario. The below example shows a
|
||||
|
|
|
@ -378,7 +378,7 @@ SCDC Helper Functions Reference
|
|||
HDMI Infoframes Helper Reference
|
||||
================================
|
||||
|
||||
Strictly speaking this is not a DRM helper library but generally useable
|
||||
Strictly speaking this is not a DRM helper library but generally usable
|
||||
by any driver interfacing with HDMI outputs like v4l or alsa drivers.
|
||||
But it nicely fits into the overall topic of mode setting helper
|
||||
libraries and hence is also included here.
|
||||
|
|
|
@ -66,11 +66,11 @@ Composition Properties`_ and related chapters.
|
|||
For the output routing the first step is encoders (represented by
|
||||
:c:type:`struct drm_encoder <drm_encoder>`, see `Encoder Abstraction`_). Those
|
||||
are really just internal artifacts of the helper libraries used to implement KMS
|
||||
drivers. Besides that they make it unecessarily more complicated for userspace
|
||||
drivers. Besides that they make it unnecessarily more complicated for userspace
|
||||
to figure out which connections between a CRTC and a connector are possible, and
|
||||
what kind of cloning is supported, they serve no purpose in the userspace API.
|
||||
Unfortunately encoders have been exposed to userspace, hence can't remove them
|
||||
at this point. Futhermore the exposed restrictions are often wrongly set by
|
||||
at this point. Furthermore the exposed restrictions are often wrongly set by
|
||||
drivers, and in many cases not powerful enough to express the real restrictions.
|
||||
A CRTC can be connected to multiple encoders, and for an active CRTC there must
|
||||
be at least one encoder.
|
||||
|
@ -260,7 +260,7 @@ Taken all together there's two consequences for the atomic design:
|
|||
drm_crtc_state <drm_crtc_state>` for CRTCs and :c:type:`struct
|
||||
drm_connector_state <drm_connector_state>` for connectors. These are the only
|
||||
objects with userspace-visible and settable state. For internal state drivers
|
||||
can subclass these structures through embeddeding, or add entirely new state
|
||||
can subclass these structures through embedding, or add entirely new state
|
||||
structures for their globally shared hardware functions, see :c:type:`struct
|
||||
drm_private_state<drm_private_state>`.
|
||||
|
||||
|
|
|
@ -8,7 +8,7 @@ DRM drivers can choose to export partly standardised text output via the
|
|||
`fops->show_fdinfo()` as part of the driver specific file operations registered
|
||||
in the `struct drm_driver` object registered with the DRM core.
|
||||
|
||||
One purpose of this output is to enable writing as generic as practicaly
|
||||
One purpose of this output is to enable writing as generic as practically
|
||||
feasible `top(1)` like userspace monitoring tools.
|
||||
|
||||
Given the differences between various DRM drivers the specification of the
|
||||
|
@ -119,7 +119,7 @@ drm-engine-<keystr> tag and shall contain the maximum frequency for the given
|
|||
engine. Taken together with drm-cycles-<keystr>, this can be used to calculate
|
||||
percentage utilization of the engine, whereas drm-engine-<keystr> only reflects
|
||||
time active without considering what frequency the engine is operating as a
|
||||
percentage of it's maximum frequency.
|
||||
percentage of its maximum frequency.
|
||||
|
||||
Memory
|
||||
^^^^^^
|
||||
|
|
|
@ -17,7 +17,7 @@ Owner Module/Drivers,Group,Property Name,Type,Property Values,Object attached,De
|
|||
,Virtual GPU,“suggested X”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an X offset for a connector
|
||||
,,“suggested Y”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an Y offset for a connector
|
||||
,Optional,"""aspect ratio""",ENUM,"{ ""None"", ""4:3"", ""16:9"" }",Connector,TDB
|
||||
i915,Generic,"""Broadcast RGB""",ENUM,"{ ""Automatic"", ""Full"", ""Limited 16:235"" }",Connector,"When this property is set to Limited 16:235 and CTM is set, the hardware will be programmed with the result of the multiplication of CTM by the limited range matrix to ensure the pixels normaly in the range 0..1.0 are remapped to the range 16/255..235/255."
|
||||
i915,Generic,"""Broadcast RGB""",ENUM,"{ ""Automatic"", ""Full"", ""Limited 16:235"" }",Connector,"When this property is set to Limited 16:235 and CTM is set, the hardware will be programmed with the result of the multiplication of CTM by the limited range matrix to ensure the pixels normally in the range 0..1.0 are remapped to the range 16/255..235/255."
|
||||
,,“audio”,ENUM,"{ ""force-dvi"", ""off"", ""auto"", ""on"" }",Connector,TBD
|
||||
,SDVO-TV,“mode”,ENUM,"{ ""NTSC_M"", ""NTSC_J"", ""NTSC_443"", ""PAL_B"" } etc.",Connector,TBD
|
||||
,,"""left_margin""",RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
|
||||
|
|
|
|
@ -328,7 +328,7 @@ of course we’d better share as much as possible between different products. To
|
|||
achieve this, split the komeda device into two layers: CORE and CHIP.
|
||||
|
||||
- CORE: for common features and capabilities handling.
|
||||
- CHIP: for register programing and HW specific feature (limitation) handling.
|
||||
- CHIP: for register programming and HW specific feature (limitation) handling.
|
||||
|
||||
CORE can access CHIP by three chip function structures:
|
||||
|
||||
|
@ -481,7 +481,7 @@ Build komeda to be a Linux module driver
|
|||
Now we have two level devices:
|
||||
|
||||
- komeda_dev: describes the real display hardware.
|
||||
- komeda_kms_dev: attachs or connects komeda_dev to DRM-KMS.
|
||||
- komeda_kms_dev: attaches or connects komeda_dev to DRM-KMS.
|
||||
|
||||
All komeda operations are supplied or operated by komeda_dev or komeda_kms_dev,
|
||||
the module driver is only a simple wrapper to pass the Linux command
|
||||
|
|
|
@ -23,7 +23,7 @@ module
|
|||
The module that generated the crashdump.
|
||||
|
||||
time
|
||||
The kernel time at crash formated as seconds.microseconds.
|
||||
The kernel time at crash formatted as seconds.microseconds.
|
||||
|
||||
comm
|
||||
Comm string for the binary that generated the fault.
|
||||
|
|
|
@ -37,7 +37,7 @@ i915 with the DRM scheduler is:
|
|||
* Watchdog hooks into DRM scheduler
|
||||
* Lots of complexity of the GuC backend can be pulled out once
|
||||
integrated with DRM scheduler (e.g. state machine gets
|
||||
simplier, locking gets simplier, etc...)
|
||||
simpler, locking gets simpler, etc...)
|
||||
* Execlists backend will minimum required to hook in the DRM scheduler
|
||||
* Legacy interface
|
||||
* Features like timeslicing / preemption / virtual engines would
|
||||
|
|
|
@ -90,7 +90,7 @@ submission, they need only one dma-resv fence list updated. Thus, the fast
|
|||
path (where required mappings are already bound) submission latency is O(1)
|
||||
w.r.t the number of VM private BOs.
|
||||
|
||||
VM_BIND locking hirarchy
|
||||
VM_BIND locking hierarchy
|
||||
-------------------------
|
||||
The locking design here supports the older (execlist based) execbuf mode, the
|
||||
newer VM_BIND mode, the VM_BIND mode with GPU page faults and possible future
|
||||
|
|
|
@ -65,7 +65,7 @@ Clean up the clipped coordination confusion around planes
|
|||
---------------------------------------------------------
|
||||
|
||||
We have a helper to get this right with drm_plane_helper_check_update(), but
|
||||
it's not consistently used. This should be fixed, preferrably in the atomic
|
||||
it's not consistently used. This should be fixed, preferably in the atomic
|
||||
helpers (and drivers then moved over to clipped coordinates). Probably the
|
||||
helper should also be moved from drm_plane_helper.c to the atomic helpers, to
|
||||
avoid confusion - the other helpers in that file are all deprecated legacy
|
||||
|
@ -181,13 +181,13 @@ reversed.
|
|||
|
||||
To solve this we need one standard per-object locking mechanism, which is
|
||||
dma_resv_lock(). This lock needs to be called as the outermost lock, with all
|
||||
other driver specific per-object locks removed. The problem is tha rolling out
|
||||
other driver specific per-object locks removed. The problem is that rolling out
|
||||
the actual change to the locking contract is a flag day, due to struct dma_buf
|
||||
buffer sharing.
|
||||
|
||||
Level: Expert
|
||||
|
||||
Convert logging to drm_* functions with drm_device paramater
|
||||
Convert logging to drm_* functions with drm_device parameter
|
||||
------------------------------------------------------------
|
||||
|
||||
For drivers which could have multiple instances, it is necessary to
|
||||
|
@ -244,7 +244,7 @@ Level: Advanced
|
|||
Benchmark and optimize blitting and format-conversion function
|
||||
--------------------------------------------------------------
|
||||
|
||||
Drawing to dispay memory quickly is crucial for many applications'
|
||||
Drawing to display memory quickly is crucial for many applications'
|
||||
performance.
|
||||
|
||||
On at least x86-64, sys_imageblit() is significantly slower than
|
||||
|
|
|
@ -345,7 +345,7 @@ PMBUS_NO_CAPABILITY
|
|||
|
||||
Some PMBus chips don't respond with valid data when reading the CAPABILITY
|
||||
register. For such chips, this flag should be set so that the PMBus core
|
||||
driver doesn't use CAPABILITY to determine it's behavior.
|
||||
driver doesn't use CAPABILITY to determine its behavior.
|
||||
|
||||
PMBUS_READ_STATUS_AFTER_FAILED_CHECK
|
||||
|
||||
|
|
|
@ -49,7 +49,7 @@ OP DATA
|
|||
== ====
|
||||
|
||||
The 2B, LEN and CS fields have disappeared, probably because USB handles
|
||||
frames and data corruption is handled or unsignificant.
|
||||
frames and data corruption is handled or insignificant.
|
||||
|
||||
First, I describe effects that are sent by the device to the computer
|
||||
|
||||
|
|
|
@ -383,7 +383,7 @@ Finger Tracking
|
|||
---------------
|
||||
|
||||
The process of finger tracking, i.e., to assign a unique trackingID to each
|
||||
initiated contact on the surface, is a Euclidian Bipartite Matching
|
||||
initiated contact on the surface, is a Euclidean Bipartite Matching
|
||||
problem. At each event synchronization, the set of actual contacts is
|
||||
matched to the set of contacts from the previous synchronization. A full
|
||||
implementation can be found in [#f3]_.
|
||||
|
|
|
@ -40,7 +40,7 @@ Principally, the reliable stacktrace function must ensure that either:
|
|||
.. note::
|
||||
In some cases it is legitimate to omit specific functions from the trace,
|
||||
but all other functions must be reported. These cases are described in
|
||||
futher detail below.
|
||||
further detail below.
|
||||
|
||||
Secondly, the reliable stacktrace function must be robust to cases where
|
||||
the stack or other unwind state is corrupt or otherwise unreliable. The
|
||||
|
|
|
@ -29,7 +29,7 @@ the validator will shoot a splat if incorrect.
|
|||
A lock-class's behavior is constructed by its instances collectively:
|
||||
when the first instance of a lock-class is used after bootup the class
|
||||
gets registered, then all (subsequent) instances will be mapped to the
|
||||
class and hence their usages and dependecies will contribute to those of
|
||||
class and hence their usages and dependencies will contribute to those of
|
||||
the class. A lock-class does not go away when a lock instance does, but
|
||||
it can be removed if the memory space of the lock class (static or
|
||||
dynamic) is reclaimed, this happens for example when a module is
|
||||
|
@ -105,7 +105,7 @@ exact case is for the lock as of the reporting time.
|
|||
+--------------+-------------+--------------+
|
||||
|
||||
The character '-' suggests irq is disabled because if otherwise the
|
||||
charactor '?' would have been shown instead. Similar deduction can be
|
||||
character '?' would have been shown instead. Similar deduction can be
|
||||
applied for '+' too.
|
||||
|
||||
Unused locks (e.g., mutexes) cannot be part of the cause of an error.
|
||||
|
|
|
@ -113,7 +113,7 @@ stutter
|
|||
without pausing.
|
||||
|
||||
shuffle_interval
|
||||
The number of seconds to keep the test threads affinitied
|
||||
The number of seconds to keep the test threads affinitized
|
||||
to a particular subset of the CPUs, defaults to 3 seconds.
|
||||
Used in conjunction with test_no_idle_hz.
|
||||
|
||||
|
|
|
@ -500,7 +500,7 @@ caveats also apply to bit spinlocks.
|
|||
Some bit spinlocks are replaced with regular spinlock_t for PREEMPT_RT
|
||||
using conditional (#ifdef'ed) code changes at the usage site. In contrast,
|
||||
usage-site changes are not needed for the spinlock_t substitution.
|
||||
Instead, conditionals in header files and the core locking implemementation
|
||||
Instead, conditionals in header files and the core locking implementation
|
||||
enable the compiler to do the substitution transparently.
|
||||
|
||||
|
||||
|
|
|
@ -417,7 +417,7 @@ entries. Any attempt to access the swap entry results in a fault which is
|
|||
resovled by replacing the entry with the original mapping. A driver gets
|
||||
notified that the mapping has been changed by MMU notifiers, after which point
|
||||
it will no longer have exclusive access to the page. Exclusive access is
|
||||
guranteed to last until the driver drops the page lock and page reference, at
|
||||
guaranteed to last until the driver drops the page lock and page reference, at
|
||||
which point any CPU faults on the page may proceed as described.
|
||||
|
||||
Memory cgroup (memcg) and rss accounting
|
||||
|
|
|
@ -48,7 +48,7 @@ of applications. KVM support requires a recent qemu-kvm release.
|
|||
For the KVM use there was need for a new signal type so that
|
||||
KVM can inject the machine check into the guest with the proper
|
||||
address. This in theory allows other applications to handle
|
||||
memory failures too. The expection is that near all applications
|
||||
memory failures too. The expectation is that most applications
|
||||
won't do that, but some very specialized ones might.
|
||||
|
||||
Failure recovery modes
|
||||
|
|
|
@ -180,7 +180,7 @@ The following events (counters) can be used to monitor page migration.
|
|||
4. THP_MIGRATION_FAIL: A THP could not be migrated nor it could be split.
|
||||
|
||||
5. THP_MIGRATION_SPLIT: A THP was migrated, but not as such: first, the THP had
|
||||
to be split. After splitting, a migration retry was used for it's sub-pages.
|
||||
to be split. After splitting, a migration retry was used for its sub-pages.
|
||||
|
||||
THP_MIGRATION_* events also update the appropriate PGMIGRATE_SUCCESS or
|
||||
PGMIGRATE_FAIL events. For example, a THP migration failure will cause both
|
||||
|
|
|
@ -463,7 +463,7 @@ can request that a region of memory be mlocked by supplying the MAP_LOCKED flag
|
|||
to the mmap() call. There is one important and subtle difference here, though.
|
||||
mmap() + mlock() will fail if the range cannot be faulted in (e.g. because
|
||||
mm_populate fails) and returns with ENOMEM while mmap(MAP_LOCKED) will not fail.
|
||||
The mmaped area will still have properties of the locked area - pages will not
|
||||
The mmapped area will still have properties of the locked area - pages will not
|
||||
get swapped out - but major page faults to fault memory in might still happen.
|
||||
|
||||
Furthermore, any mmap() call or brk() call that expands the heap by a task
|
||||
|
|
|
@ -11,7 +11,7 @@ HugeTLB
|
|||
This section is to explain how HugeTLB Vmemmap Optimization (HVO) works.
|
||||
|
||||
The ``struct page`` structures are used to describe a physical page frame. By
|
||||
default, there is a one-to-one mapping from a page frame to it's corresponding
|
||||
default, there is a one-to-one mapping from a page frame to its corresponding
|
||||
``struct page``.
|
||||
|
||||
HugeTLB pages consist of multiple base page size pages and is supported by many
|
||||
|
|
|
@ -41,7 +41,7 @@ properties:
|
|||
description: Name of the define for the family name.
|
||||
type: string
|
||||
c-version-name:
|
||||
description: Name of the define for the verion of the family.
|
||||
description: Name of the define for the version of the family.
|
||||
type: string
|
||||
max-by-define:
|
||||
description: Makes the number of attributes and commands be specified by a define, not an enum value.
|
||||
|
|
|
@ -41,7 +41,7 @@ properties:
|
|||
description: Name of the define for the family name.
|
||||
type: string
|
||||
c-version-name:
|
||||
description: Name of the define for the verion of the family.
|
||||
description: Name of the define for the version of the family.
|
||||
type: string
|
||||
max-by-define:
|
||||
description: Makes the number of attributes and commands be specified by a define, not an enum value.
|
||||
|
|
|
@ -1636,7 +1636,7 @@ your init script::
|
|||
-----------------------------------------
|
||||
|
||||
This section applies to distros which use /etc/network/interfaces file
|
||||
to describe network interface configuration, most notably Debian and it's
|
||||
to describe network interface configuration, most notably Debian and its
|
||||
derivatives.
|
||||
|
||||
The ifup and ifdown commands on Debian don't support bonding out of
|
||||
|
|
|
@ -321,9 +321,9 @@ API allows to configure following rate object's parameters:
|
|||
Allows for usage of Weighted Fair Queuing arbitration scheme among
|
||||
siblings. This arbitration scheme can be used simultaneously with the
|
||||
strict priority. As a node is configured with a higher rate it gets more
|
||||
BW relative to it's siblings. Values are relative like a percentage
|
||||
BW relative to its siblings. Values are relative like a percentage
|
||||
points, they basically tell how much BW should node take relative to
|
||||
it's siblings.
|
||||
its siblings.
|
||||
|
||||
``parent``
|
||||
Parent node name. Parent node rate limits are considered as additional limits
|
||||
|
@ -343,7 +343,7 @@ Arbitration flow from the high level:
|
|||
#. If group of nodes have the same priority perform WFQ arbitration on
|
||||
that subgroup. Use ``tx_weight`` as a parameter for this arbitration.
|
||||
|
||||
#. Select the winner node, and continue arbitration flow among it's children,
|
||||
#. Select the winner node, and continue arbitration flow among its children,
|
||||
until leaf node is reached, and the winner is established.
|
||||
|
||||
#. If all the nodes from the highest priority sub-group are satisfied, or
|
||||
|
|
|
@ -755,7 +755,7 @@ AF_PACKET TPACKET_V3 example
|
|||
============================
|
||||
|
||||
AF_PACKET's TPACKET_V3 ring buffer can be configured to use non-static frame
|
||||
sizes by doing it's own memory management. It is based on blocks where polling
|
||||
sizes by doing its own memory management. It is based on blocks where polling
|
||||
works on a per block basis instead of per ring as in TPACKET_V2 and predecessor.
|
||||
|
||||
It is said that TPACKET_V3 brings the following benefits:
|
||||
|
|
|
@ -87,9 +87,9 @@ CONFIG_ENERGY_MODEL must be enabled to use the EM framework.
|
|||
Registration of 'advanced' EM
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
The 'advanced' EM gets it's name due to the fact that the driver is allowed
|
||||
The 'advanced' EM gets its name due to the fact that the driver is allowed
|
||||
to provide more precised power model. It's not limited to some implemented math
|
||||
formula in the framework (like it's in 'simple' EM case). It can better reflect
|
||||
formula in the framework (like it is in 'simple' EM case). It can better reflect
|
||||
the real power measurements performed for each performance state. Thus, this
|
||||
registration method should be preferred in case considering EM static power
|
||||
(leakage) is important.
|
||||
|
|
|
@ -6,7 +6,7 @@ DSCR register in powerpc allows user to have some control of prefetch of data
|
|||
stream in the processor. Please refer to the ISA documents or related manual
|
||||
for more detailed information regarding how to use this DSCR to attain this
|
||||
control of the prefetches . This document here provides an overview of kernel
|
||||
support for DSCR, related kernel objects, it's functionalities and exported
|
||||
support for DSCR, related kernel objects, its functionalities and exported
|
||||
user interface.
|
||||
|
||||
(A) Data Structures:
|
||||
|
|
|
@ -40,7 +40,7 @@ checks can be delayed until after the MMU is set is up, and we can just not
|
|||
instrument any code that runs with translations off after booting. This is the
|
||||
current approach.
|
||||
|
||||
To avoid this limitiation, the KASAN shadow would have to be placed inside the
|
||||
To avoid this limitation, the KASAN shadow would have to be placed inside the
|
||||
linear mapping, using the same high-bits trick we use for the rest of the linear
|
||||
mapping. This is tricky:
|
||||
|
||||
|
|
|
@ -22,7 +22,7 @@ privileged operations. Currently there are two PAPR compliant hypervisors:
|
|||
On PPC64 arch a guest kernel running on top of a PAPR hypervisor is called
|
||||
a *pSeries guest*. A pseries guest runs in a supervisor mode (HV=0) and must
|
||||
issue hypercalls to the hypervisor whenever it needs to perform an action
|
||||
that is hypervisor priviledged [3]_ or for other services managed by the
|
||||
that is hypervisor privileged [3]_ or for other services managed by the
|
||||
hypervisor.
|
||||
|
||||
Hence a Hypercall (hcall) is essentially a request by the pseries guest
|
||||
|
|
|
@ -232,11 +232,11 @@ For example, to match the 8323, revision 1.0::
|
|||
'extended_modes' is a bitfield that defines special functionality which has an
|
||||
impact on the device drivers. Each bit has its own impact and has special
|
||||
instructions for the driver associated with it. This field is stored in
|
||||
the QE library and available to any driver that calles qe_get_firmware_info().
|
||||
the QE library and available to any driver that calls qe_get_firmware_info().
|
||||
|
||||
'vtraps' is an array of 8 words that contain virtual trap values for each
|
||||
virtual traps. As with 'extended_modes', this field is stored in the QE
|
||||
library and available to any driver that calles qe_get_firmware_info().
|
||||
library and available to any driver that calls qe_get_firmware_info().
|
||||
|
||||
'microcode' (type: struct qe_microcode):
|
||||
For each RISC processor there is one 'microcode' structure. The first
|
||||
|
|
|
@ -46,7 +46,7 @@ request queue into the application's virtual address space.
|
|||
The application can then submit one or more requests to the engine by
|
||||
using copy/paste instructions and pasting the CRBs to the virtual address
|
||||
(aka paste_address) returned by mmap(). User space can close the
|
||||
established connection or send window by closing the file descriptior
|
||||
established connection or send window by closing the file descriptor
|
||||
(close(fd)) or upon the process exit.
|
||||
|
||||
Note that applications can send several requests with the same window or
|
||||
|
@ -240,7 +240,7 @@ issued. This signal returns with the following siginfo struct::
|
|||
siginfo.si_signo = SIGSEGV;
|
||||
siginfo.si_errno = EFAULT;
|
||||
siginfo.si_code = SEGV_MAPERR;
|
||||
siginfo.si_addr = CSB adress;
|
||||
siginfo.si_addr = CSB address;
|
||||
|
||||
In the case of multi-thread applications, NX send windows can be shared
|
||||
across all threads. For example, a child thread can open a send window,
|
||||
|
|
|
@ -208,7 +208,7 @@ Not every problem needs a new ioctl:
|
|||
it's much quicker to push a driver-private interface than engaging in
|
||||
lengthy discussions for a more generic solution. And occasionally doing a
|
||||
private interface to spearhead a new concept is what's required. But in the
|
||||
end, once the generic interface comes around you'll end up maintainer two
|
||||
end, once the generic interface comes around you'll end up maintaining two
|
||||
interfaces. Indefinitely.
|
||||
|
||||
* Consider other interfaces than ioctls. A sysfs attribute is much better for
|
||||
|
|
|
@ -29,7 +29,7 @@ All documents are cataloged with the following fields: the document's
|
|||
|
||||
The documents on each section of this document are ordered by its
|
||||
published date, from the newest to the oldest. The maintainer(s) should
|
||||
periodically retire resources as they become obsolte or outdated; with
|
||||
periodically retire resources as they become obsolete or outdated; with
|
||||
the exception of foundational books.
|
||||
|
||||
Docs at the Linux Kernel tree
|
||||
|
|
|
@ -88,11 +88,11 @@ The following keys are defined:
|
|||
always extremely slow.
|
||||
|
||||
* :c:macro:`RISCV_HWPROBE_MISALIGNED_SLOW`: Misaligned accesses are supported
|
||||
in hardware, but are slower than the cooresponding aligned accesses
|
||||
in hardware, but are slower than the corresponding aligned accesses
|
||||
sequences.
|
||||
|
||||
* :c:macro:`RISCV_HWPROBE_MISALIGNED_FAST`: Misaligned accesses are supported
|
||||
in hardware and are faster than the cooresponding aligned accesses
|
||||
in hardware and are faster than the corresponding aligned accesses
|
||||
sequences.
|
||||
|
||||
* :c:macro:`RISCV_HWPROBE_MISALIGNED_UNSUPPORTED`: Misaligned accesses are
|
||||
|
|
|
@ -13,7 +13,7 @@ order to support the use of the RISC-V Vector Extension.
|
|||
Two new prctl() calls are added to allow programs to manage the enablement
|
||||
status for the use of Vector in userspace. The intended usage guideline for
|
||||
these interfaces is to give init systems a way to modify the availability of V
|
||||
for processes running under its domain. Calling thess interfaces is not
|
||||
for processes running under its domain. Calling these interfaces is not
|
||||
recommended in libraries routines because libraries should not override policies
|
||||
configured from the parant process. Also, users must noted that these interfaces
|
||||
are not portable to non-Linux, nor non-RISC-V environments, so it is discourage
|
||||
|
|
|
@ -422,7 +422,7 @@ Configure the guest's AP resources
|
|||
Configuring the AP resources for a KVM guest will be performed when the
|
||||
VFIO_GROUP_NOTIFY_SET_KVM notifier callback is invoked. The notifier
|
||||
function is called when userspace connects to KVM. The guest's AP resources are
|
||||
configured via it's APCB by:
|
||||
configured via its APCB by:
|
||||
|
||||
* Setting the bits in the APM corresponding to the APIDs assigned to the
|
||||
vfio_ap mediated device via its 'assign_adapter' interface.
|
||||
|
|
|
@ -186,7 +186,7 @@ average usage, albeit over a longer time window than a single period. This
|
|||
also limits the burst ability to no more than 1ms per cpu. This provides
|
||||
better more predictable user experience for highly threaded applications with
|
||||
small quota limits on high core count machines. It also eliminates the
|
||||
propensity to throttle these applications while simultanously using less than
|
||||
propensity to throttle these applications while simultaneously using less than
|
||||
quota amounts of cpu. Another way to say this, is that by allowing the unused
|
||||
portion of a slice to remain valid across periods we have decreased the
|
||||
possibility of wastefully expiring quota on cpu-local silos that don't need a
|
||||
|
|
|
@ -82,7 +82,7 @@ through the arch_scale_cpu_capacity() callback.
|
|||
The rest of platform knowledge used by EAS is directly read from the Energy
|
||||
Model (EM) framework. The EM of a platform is composed of a power cost table
|
||||
per 'performance domain' in the system (see Documentation/power/energy-model.rst
|
||||
for futher details about performance domains).
|
||||
for further details about performance domains).
|
||||
|
||||
The scheduler manages references to the EM objects in the topology code when the
|
||||
scheduling domains are built, or re-built. For each root domain (rd), the
|
||||
|
@ -281,7 +281,7 @@ mechanism called 'over-utilization'.
|
|||
From a general standpoint, the use-cases where EAS can help the most are those
|
||||
involving a light/medium CPU utilization. Whenever long CPU-bound tasks are
|
||||
being run, they will require all of the available CPU capacity, and there isn't
|
||||
much that can be done by the scheduler to save energy without severly harming
|
||||
much that can be done by the scheduler to save energy without severely harming
|
||||
throughput. In order to avoid hurting performance with EAS, CPUs are flagged as
|
||||
'over-utilized' as soon as they are used at more than 80% of their compute
|
||||
capacity. As long as no CPUs are over-utilized in a root domain, load balancing
|
||||
|
|
|
@ -427,7 +427,7 @@ Changes from 20041207 to 20041213
|
|||
* Changed version number to 8.0.17
|
||||
* Fix sparse warnings by adding __iomem markers to lpfc_compat.h.
|
||||
* Fix some sparse warnings -- 0 used as NULL pointer.
|
||||
* Make sure there's a space between every if and it's (.
|
||||
* Make sure there's a space between every if and its (.
|
||||
* Fix some overly long lines and make sure hard tabs are used for
|
||||
indentation.
|
||||
* Remove all trailing whitespace.
|
||||
|
|
|
@ -82,7 +82,7 @@ The signing and key management utilities evm-utils provide functionality
|
|||
to generate signatures, to load keys into the kernel keyring.
|
||||
Keys can be in PEM or converted to the kernel format.
|
||||
When the key is added to the kernel keyring, the keyid defines the name
|
||||
of the key: 5D2B05FC633EE3E8 in the example bellow.
|
||||
of the key: 5D2B05FC633EE3E8 in the example below.
|
||||
|
||||
Here is example output of the keyctl utility::
|
||||
|
||||
|
|
|
@ -869,7 +869,7 @@ The keyctl syscall functions are:
|
|||
|
||||
- ``char *hashname`` specifies the NUL terminated string identifying
|
||||
the hash used from the kernel crypto API and applied for the KDF
|
||||
operation. The KDF implemenation complies with SP800-56A as well
|
||||
operation. The KDF implementation complies with SP800-56A as well
|
||||
as with SP800-108 (the counter KDF).
|
||||
|
||||
- ``char *otherinfo`` specifies the OtherInfo data as documented in
|
||||
|
|
|
@ -34,7 +34,7 @@ be use it for its own purposes.
|
|||
|
||||
During the VM's launch, the virtual machine manager may inject a secret to that
|
||||
area. In AMD SEV and SEV-ES this is performed using the
|
||||
``KVM_SEV_LAUNCH_SECRET`` command (see [sev]_). The strucutre of the injected
|
||||
``KVM_SEV_LAUNCH_SECRET`` command (see [sev]_). The structure of the injected
|
||||
Guest Owner secret data should be a GUIDed table of secret values; the binary
|
||||
format is described in ``drivers/virt/coco/efi_secret/efi_secret.c`` under
|
||||
"Structure of the EFI secret area".
|
||||
|
|
|
@ -178,7 +178,7 @@ class CObject(Base_CObject):
|
|||
if len(arglist[0].split(" ")) > 1:
|
||||
return False
|
||||
|
||||
# This is a function-like macro, it's arguments are typeless!
|
||||
# This is a function-like macro, its arguments are typeless!
|
||||
signode += addnodes.desc_name(fullname, fullname)
|
||||
paramlist = addnodes.desc_parameterlist()
|
||||
signode += paramlist
|
||||
|
|
Some files were not shown because too many files have changed in this diff Show More
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Reference in New Issue