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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/compiler-gcc4.h
1 #ifndef __LINUX_COMPILER_H
2 #error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
5 /* GCC 4.1.[01] miscompiles __weak */
6 #if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
7 # error Your version of gcc miscompiles the __weak directive
10 #define __used __attribute__((__used__))
11 #define __must_check __attribute__((warn_unused_result))
12 #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
13 #define __always_inline inline __attribute__((always_inline))
16 * A trick to suppress uninitialized variable warning without generating any
19 #define uninitialized_var(x) x = x
21 #if __GNUC_MINOR__ >= 3
22 /* Mark functions as cold. gcc will assume any path leading to a call
23 to them will be unlikely. This means a lot of manual unlikely()s
24 are unnecessary now for any paths leading to the usual suspects
25 like BUG(), printk(), panic() etc. [but let's keep them for now for
28 Early snapshots of gcc 4.3 don't support this and we can't detect this
29 in the preprocessor, but we can live with this because they're unreleased.
30 Maketime probing would be overkill here.
32 gcc also has a __attribute__((__hot__)) to move hot functions into
33 a special section, but I don't see any sense in this right now in
35 #define __cold __attribute__((__cold__))