root/include/linux/compiler-gcc.h

INCLUDED FROM

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

/*
 * 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])))

/*
 * Force always-inline if the user requests it so via the .config,
 * or if gcc is too old:
 */
#if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \
    !defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4)
# define inline         inline          __attribute__((always_inline))
# define __inline__     __inline__      __attribute__((always_inline))
# define __inline       __inline        __attribute__((always_inline))
#endif

#define __deprecated                    __attribute__((deprecated))
#define __packed                        __attribute__((packed))
#define __weak                          __attribute__((weak))
#define __naked                         __attribute__((naked))
#define __noreturn                      __attribute__((noreturn))

/*
 * 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.
 * [...]
 */
#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_const__             __attribute__((__const__))
#define __maybe_unused                  __attribute__((unused))