include/linux/compiler-gcc.h

   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 */
  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  */
  20 #define RELOC_HIDE(ptr, off)                                    \
  21   ({ unsigned long __ptr;                                       \
  22     __asm__ ("" : "=r"(__ptr) : "0"(ptr));              \
  23     (typeof(ptr)) (__ptr + (off)); })
  24
  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])))
  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))
  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)))
  40 #define  noinline                       __attribute__((noinline))
  41 #define __attribute_pure__              __attribute__((pure))
  42 #define __attribute_const__             __attribute__((__const__))
  43 #define __maybe_unused                  __attribute__((unused))