[linux-block.git] / include / linux / compiler-gcc.h

/* Never include this file directly.  Include <linux/compiler.h> instead.  */

/*
 * Common definitions for all gcc versions go here.
 */


/* Optimization barrier */
/* The "volatile" is due to gcc bugs */
#define barrier() __asm__ __volatile__("": : :"memory")

/* This macro obfuscates arithmetic on a variable address so that gcc
   shouldn't recognize the original var, and make assumptions about it */
/*
 * Versions of the ppc64 compiler before 4.1 had a bug where use of
 * RELOC_HIDE could trash r30. The bug can be worked around by changing
 * the inline assembly constraint from =g to =r, in this particular
 * case either is valid.
 */
#define RELOC_HIDE(ptr, off)					\
  ({ unsigned long __ptr;					\
    __asm__ ("" : "=r"(__ptr) : "0"(ptr));		\
    (typeof(ptr)) (__ptr + (off)); })

/* &a[0] degrades to a pointer: a different type from an array */
#define __must_be_array(a) \
  BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0])))

#define inline		inline		__attribute__((always_inline))
#define __inline__	__inline__	__attribute__((always_inline))
#define __inline	__inline	__attribute__((always_inline))
#define __deprecated			__attribute__((deprecated))
#define __packed			__attribute__((packed))
#define __weak				__attribute__((weak))
#define __naked				__attribute__((naked))
#define __noreturn			__attribute__((noreturn))
#define __pure				__attribute__((pure))
#define __aligned(x)			__attribute__((aligned(x)))
#define __printf(a,b)			__attribute__((format(printf,a,b)))
#define  noinline			__attribute__((noinline))
#define __attribute_pure__		__attribute__((pure))
#define __attribute_const__		__attribute__((__const__))
#define __maybe_unused			__attribute__((unused))
Commit	Line	Data
1da177e4 LT	1	/* Never include this file directly. Include <linux/compiler.h> instead. */
	2
	3	/*
	4	* Common definitions for all gcc versions go here.
	5	*/
	6
	7
	8	/* Optimization barrier */
	9	/* The "volatile" is due to gcc bugs */
	10	#define barrier() __asm__ __volatile__("": : :"memory")
	11
	12	/* This macro obfuscates arithmetic on a variable address so that gcc
	13	shouldn't recognize the original var, and make assumptions about it */
c8d52465 AB	14	/*
	15	* Versions of the ppc64 compiler before 4.1 had a bug where use of
	16	* RELOC_HIDE could trash r30. The bug can be worked around by changing
	17	* the inline assembly constraint from =g to =r, in this particular
	18	* case either is valid.
	19	*/
1da177e4 LT	20	#define RELOC_HIDE(ptr, off) \
1da177e4 LT	21	({ unsigned long __ptr; \
c8d52465	22	__asm__ ("" : "=r"(__ptr) : "0"(ptr)); \
1da177e4	23	(typeof(ptr)) (__ptr + (off)); })
a1365647	24
c5e631cf RR	25	/* &a[0] degrades to a pointer: a different type from an array */
	26	#define __must_be_array(a) \
	27	BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0])))
a1365647 AM	28
	29	#define inline inline __attribute__((always_inline))
	30	#define __inline__ __inline__ __attribute__((always_inline))
	31	#define __inline __inline __attribute__((always_inline))
	32	#define __deprecated __attribute__((deprecated))
82ddcb04 RD	33	#define __packed __attribute__((packed))
	34	#define __weak __attribute__((weak))
	35	#define __naked __attribute__((naked))
	36	#define __noreturn __attribute__((noreturn))
	37	#define __pure __attribute__((pure))
	38	#define __aligned(x) __attribute__((aligned(x)))
	39	#define __printf(a,b) __attribute__((format(printf,a,b)))
a1365647 AM	40	#define noinline __attribute__((noinline))
	41	#define __attribute_pure__ __attribute__((pure))
	42	#define __attribute_const__ __attribute__((__const__))
0d7ebbbc	43	#define __maybe_unused __attribute__((unused))