[GitHub/mt8127/android_kernel_alcatel_ttab.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

/* GCC 4.1.[01] miscompiles __weak */
#if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
# error Your version of gcc miscompiles the __weak directive
#endif

#define __used			__attribute__((__used__))
#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_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	4
f9d14250 LT	5	/* GCC 4.1.[01] miscompiles __weak */
	6	#if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
	7	# error Your version of gcc miscompiles the __weak directive
	8	#endif
	9
0d7ebbbc	10	#define __used __attribute__((__used__))
1da177e4 LT	11	#define __must_check __attribute__((warn_unused_result))
1da177e4 LT	12	#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
40fc55cb	13	#define __always_inline inline __attribute__((always_inline))
94909914 BP	14
	15	/*
	16	* A trick to suppress uninitialized variable warning without generating any
	17	* code
	18	*/
	19	#define uninitialized_var(x) x = x
a586df06	20
f153b821	21	#if __GNUC_MINOR__ >= 3
a586df06 AK	22	/* Mark functions as cold. gcc will assume any path leading to a call
	23	to them will be unlikely. This means a lot of manual unlikely()s
	24	are unnecessary now for any paths leading to the usual suspects
	25	like BUG(), printk(), panic() etc. [but let's keep them for now for
	26	older compilers]
	27
	28	Early snapshots of gcc 4.3 don't support this and we can't detect this
	29	in the preprocessor, but we can live with this because they're unreleased.
	30	Maketime probing would be overkill here.
	31
	32	gcc also has a __attribute__((__hot__)) to move hot functions into
	33	a special section, but I don't see any sense in this right now in
	34	the kernel context */
	35	#define __cold __attribute__((__cold__))
	36
	37	#endif