1 #ifndef __LINUX_COMPILER_H
2 #error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
3 #endif
4
5 /*
6 * Common definitions for all gcc versions go here.
7 */
8
9
10 /* Optimization barrier */
11 /* The "volatile" is due to gcc bugs */
12 #define barrier() __asm__ __volatile__("": : :"memory")
13
14 /* This macro obfuscates arithmetic on a variable address so that gcc
15 shouldn't recognize the original var, and make assumptions about it */
16 /*
17 * Versions of the ppc64 compiler before 4.1 had a bug where use of
18 * RELOC_HIDE could trash r30. The bug can be worked around by changing
19 * the inline assembly constraint from =g to =r, in this particular
20 * case either is valid.
21 */
22 #define RELOC_HIDE(ptr, off) \
23 ({ unsigned long __ptr; \
24 __asm__ ("" : "=r"(__ptr) : ""(ptr)); \
25 (typeof(ptr)) (__ptr + (off)); })
26
27 /* &a[0] degrades to a pointer: a different type from an array */
28 #define __must_be_array(a) \
29 BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0])))
30
31 #define inline inline __attribute__((always_inline))
32 #define __inline__ __inline__ __attribute__((always_inline))
33 #define __inline __inline __attribute__((always_inline))
34 #define __deprecated __attribute__((deprecated))
35 #define __packed __attribute__((packed))
36 #define __weak __attribute__((weak))
37 #define __naked __attribute__((naked))
38 #define __noreturn __attribute__((noreturn))
39
40 /*
41 * From the GCC manual:
42 *
43 * Many functions have no effects except the return value and their
44 * return value depends only on the parameters and/or global
45 * variables. Such a function can be subject to common subexpression
46 * elimination and loop optimization just as an arithmetic operator
47 * would be.
48 * [...]
49 */
50 #define __pure __attribute__((pure))
51 #define __aligned(x) __attribute__((aligned(x)))
52 #define __printf(a,b) __attribute__((format(printf,a,b)))
53 #define noinline __attribute__((noinline))
54 #define __attribute_const__ __attribute__((__const__))
55 #define __maybe_unused __attribute__((unused))
56
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