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)) 44