1 /* Public domain. */ 2 3 #ifndef _LINUX_COMPILER_H 4 #define _LINUX_COMPILER_H 5 6 #include <linux/kconfig.h> 7 #include <sys/atomic.h> /* for READ_ONCE() WRITE_ONCE() */ 8 9 #define unlikely(x) __builtin_expect(!!(x), 0) 10 #define likely(x) __builtin_expect(!!(x), 1) 11 12 #define __force 13 #define __acquires(x) 14 #define __releases(x) 15 #define __read_mostly 16 #define __iomem 17 #define __must_check 18 #define __init 19 #define __exit 20 #define __deprecated 21 #define __always_unused __attribute__((__unused__)) 22 #define __maybe_unused __attribute__((__unused__)) 23 #define __always_inline inline __attribute__((__always_inline__)) 24 #define noinline __attribute__((__noinline__)) 25 #define noinline_for_stack __attribute__((__noinline__)) 26 #define fallthrough do {} while (0) 27 28 #define __PASTE(x,y) __CONCAT(x,y) 29 30 #ifndef __user 31 #define __user 32 #endif 33 34 #define barrier() __asm volatile("" : : : "memory") 35 36 #define __printf(x, y) __attribute__((__format__(__kprintf__,x,y))) 37 38 /* The Linux code doesn't meet our usual standards! */ 39 #ifdef __clang__ 40 #pragma clang diagnostic ignored "-Winitializer-overrides" 41 #pragma clang diagnostic ignored "-Wunused-function" 42 #pragma clang diagnostic ignored "-Wunused-variable" 43 #pragma clang diagnostic ignored "-Wgnu-variable-sized-type-not-at-end" 44 #else 45 #pragma GCC diagnostic ignored "-Wformat-zero-length" 46 #endif 47 48 #endif 49