90f72aa58b
Add a flag for mmap that will be used to request a huge page region that will look like anonymous memory to user space. This is accomplished by using a file on the internal vfsmount. MAP_HUGETLB is a modifier of MAP_ANONYMOUS and so must be specified with it. The region will behave the same as a MAP_ANONYMOUS region using small pages. The patch also adds the MAP_STACK flag, which was previously defined only on some architectures but not on others. Since MAP_STACK is meant to be a hint only, architectures can define it without assigning a specific meaning to it. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Eric B Munson <ebmunson@us.ibm.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: David Rientjes <rientjes@google.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
20 lines
799 B
C
20 lines
799 B
C
#ifndef __ASM_GENERIC_MMAN_H
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#define __ASM_GENERIC_MMAN_H
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#include <asm-generic/mman-common.h>
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#define MAP_GROWSDOWN 0x0100 /* stack-like segment */
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#define MAP_DENYWRITE 0x0800 /* ETXTBSY */
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#define MAP_EXECUTABLE 0x1000 /* mark it as an executable */
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#define MAP_LOCKED 0x2000 /* pages are locked */
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#define MAP_NORESERVE 0x4000 /* don't check for reservations */
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#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
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#define MAP_NONBLOCK 0x10000 /* do not block on IO */
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#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
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#define MAP_HUGETLB 0x40000 /* create a huge page mapping */
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#define MCL_CURRENT 1 /* lock all current mappings */
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#define MCL_FUTURE 2 /* lock all future mappings */
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#endif /* __ASM_GENERIC_MMAN_H */
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