[linux-2.6-block.git] / include / linux / compiler-gcc4.h

#ifndef __LINUX_COMPILER_H
#error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
#endif

/* These definitions are for GCC v4.x.  */
#include <linux/compiler-gcc.h>

#ifdef CONFIG_FORCED_INLINING
# undef inline
# undef __inline__
# undef __inline
# define inline			inline		__attribute__((always_inline))
# define __inline__		__inline__	__attribute__((always_inline))
# define __inline		__inline	__attribute__((always_inline))
#endif

#define __used			__attribute__((__used__))
#define __attribute_used__	__used			/* deprecated */
#define __must_check 		__attribute__((warn_unused_result))
#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
#define __always_inline		inline __attribute__((always_inline))

/*
 * A trick to suppress uninitialized variable warning without generating any
 * code
 */
#define uninitialized_var(x) x = x

#if !(__GNUC__ == 4 && __GNUC_MINOR__ < 3)
/* Mark functions as cold. gcc will assume any path leading to a call
   to them will be unlikely.  This means a lot of manual unlikely()s
   are unnecessary now for any paths leading to the usual suspects
   like BUG(), printk(), panic() etc. [but let's keep them for now for
   older compilers]

   Early snapshots of gcc 4.3 don't support this and we can't detect this
   in the preprocessor, but we can live with this because they're unreleased.
   Maketime probing would be overkill here.

   gcc also has a __attribute__((__hot__)) to move hot functions into
   a special section, but I don't see any sense in this right now in
   the kernel context */
#define __cold			__attribute__((__cold__))

#endif
Commit	Line	Data
94f582f8 RD	1	#ifndef __LINUX_COMPILER_H
	2	#error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
	3	#endif
1da177e4 LT	4
	5	/* These definitions are for GCC v4.x. */
	6	#include <linux/compiler-gcc.h>
	7
a9df3d0f IM	8	#ifdef CONFIG_FORCED_INLINING
	9	# undef inline
	10	# undef __inline__
	11	# undef __inline
	12	# define inline inline __attribute__((always_inline))
	13	# define __inline__ __inline__ __attribute__((always_inline))
	14	# define __inline __inline __attribute__((always_inline))
	15	#endif
	16
0d7ebbbc DR	17	#define __used __attribute__((__used__))
0d7ebbbc DR	18	#define __attribute_used__ __used /* deprecated */
1da177e4 LT	19	#define __must_check __attribute__((warn_unused_result))
1da177e4 LT	20	#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
40fc55cb	21	#define __always_inline inline __attribute__((always_inline))
94909914 BP	22
	23	/*
	24	* A trick to suppress uninitialized variable warning without generating any
	25	* code
	26	*/
	27	#define uninitialized_var(x) x = x
a586df06 AK	28
	29	#if !(__GNUC__ == 4 && __GNUC_MINOR__ < 3)
	30	/* Mark functions as cold. gcc will assume any path leading to a call
	31	to them will be unlikely. This means a lot of manual unlikely()s
	32	are unnecessary now for any paths leading to the usual suspects
	33	like BUG(), printk(), panic() etc. [but let's keep them for now for
	34	older compilers]
	35
	36	Early snapshots of gcc 4.3 don't support this and we can't detect this
	37	in the preprocessor, but we can live with this because they're unreleased.
	38	Maketime probing would be overkill here.
	39
	40	gcc also has a __attribute__((__hot__)) to move hot functions into
	41	a special section, but I don't see any sense in this right now in
	42	the kernel context */
	43	#define __cold __attribute__((__cold__))
	44
	45	#endif