512345be25
Add a deprecated_for_modules macro that allows symbols to be deprecated only when used by modules, as suggested by Andrew Morton some months back. Signed-off-by: Paul E. McKenney <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
159 lines
4.3 KiB
C
159 lines
4.3 KiB
C
#ifndef __LINUX_COMPILER_H
|
|
#define __LINUX_COMPILER_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#ifdef __CHECKER__
|
|
# define __user __attribute__((noderef, address_space(1)))
|
|
# define __kernel /* default address space */
|
|
# define __safe __attribute__((safe))
|
|
# define __force __attribute__((force))
|
|
# define __nocast __attribute__((nocast))
|
|
# define __iomem __attribute__((noderef, address_space(2)))
|
|
# define __acquires(x) __attribute__((context(0,1)))
|
|
# define __releases(x) __attribute__((context(1,0)))
|
|
# define __acquire(x) __context__(1)
|
|
# define __release(x) __context__(-1)
|
|
# define __cond_lock(x) ((x) ? ({ __context__(1); 1; }) : 0)
|
|
extern void __chk_user_ptr(void __user *);
|
|
extern void __chk_io_ptr(void __iomem *);
|
|
#else
|
|
# define __user
|
|
# define __kernel
|
|
# define __safe
|
|
# define __force
|
|
# define __nocast
|
|
# define __iomem
|
|
# define __chk_user_ptr(x) (void)0
|
|
# define __chk_io_ptr(x) (void)0
|
|
# define __builtin_warning(x, y...) (1)
|
|
# define __acquires(x)
|
|
# define __releases(x)
|
|
# define __acquire(x) (void)0
|
|
# define __release(x) (void)0
|
|
# define __cond_lock(x) (x)
|
|
#endif
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#if __GNUC__ > 4
|
|
#error no compiler-gcc.h file for this gcc version
|
|
#elif __GNUC__ == 4
|
|
# include <linux/compiler-gcc4.h>
|
|
#elif __GNUC__ == 3
|
|
# include <linux/compiler-gcc3.h>
|
|
#elif __GNUC__ == 2
|
|
# include <linux/compiler-gcc2.h>
|
|
#else
|
|
# error Sorry, your compiler is too old/not recognized.
|
|
#endif
|
|
|
|
/* Intel compiler defines __GNUC__. So we will overwrite implementations
|
|
* coming from above header files here
|
|
*/
|
|
#ifdef __INTEL_COMPILER
|
|
# include <linux/compiler-intel.h>
|
|
#endif
|
|
|
|
/*
|
|
* Generic compiler-dependent macros required for kernel
|
|
* build go below this comment. Actual compiler/compiler version
|
|
* specific implementations come from the above header files
|
|
*/
|
|
|
|
#define likely(x) __builtin_expect(!!(x), 1)
|
|
#define unlikely(x) __builtin_expect(!!(x), 0)
|
|
|
|
/* Optimization barrier */
|
|
#ifndef barrier
|
|
# define barrier() __memory_barrier()
|
|
#endif
|
|
|
|
#ifndef RELOC_HIDE
|
|
# define RELOC_HIDE(ptr, off) \
|
|
({ unsigned long __ptr; \
|
|
__ptr = (unsigned long) (ptr); \
|
|
(typeof(ptr)) (__ptr + (off)); })
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
/*
|
|
* Allow us to mark functions as 'deprecated' and have gcc emit a nice
|
|
* warning for each use, in hopes of speeding the functions removal.
|
|
* Usage is:
|
|
* int __deprecated foo(void)
|
|
*/
|
|
#ifndef __deprecated
|
|
# define __deprecated /* unimplemented */
|
|
#endif
|
|
|
|
#ifdef MODULE
|
|
#define __deprecated_for_modules __deprecated
|
|
#else
|
|
#define __deprecated_for_modules
|
|
#endif
|
|
|
|
#ifndef __must_check
|
|
#define __must_check
|
|
#endif
|
|
|
|
/*
|
|
* Allow us to avoid 'defined but not used' warnings on functions and data,
|
|
* as well as force them to be emitted to the assembly file.
|
|
*
|
|
* As of gcc 3.3, static functions that are not marked with attribute((used))
|
|
* may be elided from the assembly file. As of gcc 3.3, static data not so
|
|
* marked will not be elided, but this may change in a future gcc version.
|
|
*
|
|
* In prior versions of gcc, such functions and data would be emitted, but
|
|
* would be warned about except with attribute((unused)).
|
|
*/
|
|
#ifndef __attribute_used__
|
|
# define __attribute_used__ /* unimplemented */
|
|
#endif
|
|
|
|
/*
|
|
* From the GCC manual:
|
|
*
|
|
* Many functions have no effects except the return value and their
|
|
* return value depends only on the parameters and/or global
|
|
* variables. Such a function can be subject to common subexpression
|
|
* elimination and loop optimization just as an arithmetic operator
|
|
* would be.
|
|
* [...]
|
|
*/
|
|
#ifndef __attribute_pure__
|
|
# define __attribute_pure__ /* unimplemented */
|
|
#endif
|
|
|
|
/*
|
|
* From the GCC manual:
|
|
*
|
|
* Many functions do not examine any values except their arguments,
|
|
* and have no effects except the return value. Basically this is
|
|
* just slightly more strict class than the `pure' attribute above,
|
|
* since function is not allowed to read global memory.
|
|
*
|
|
* Note that a function that has pointer arguments and examines the
|
|
* data pointed to must _not_ be declared `const'. Likewise, a
|
|
* function that calls a non-`const' function usually must not be
|
|
* `const'. It does not make sense for a `const' function to return
|
|
* `void'.
|
|
*/
|
|
#ifndef __attribute_const__
|
|
# define __attribute_const__ /* unimplemented */
|
|
#endif
|
|
|
|
#ifndef noinline
|
|
#define noinline
|
|
#endif
|
|
|
|
#ifndef __always_inline
|
|
#define __always_inline inline
|
|
#endif
|
|
|
|
#endif /* __LINUX_COMPILER_H */
|