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compiler: Introduce __always_unused

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I wrote some code which is used as compile-time checker, and the
code should be elided after compile.

So I need to annotate the code as "always unused", compared to
"maybe unused".

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <4AEE2CEC.8040206@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-11-02 08:50:52 +08:00 committed by Ingo Molnar
parent c4b8ac2c1a
commit 7b2a35132a
2 changed files with 5 additions and 0 deletions
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1
include/linux/compiler-gcc.h
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@ -79,6 +79,7 @@
#define noinline __attribute__((noinline)) #define noinline __attribute__((noinline))
#define __attribute_const__ __attribute__((__const__)) #define __attribute_const__ __attribute__((__const__))
#define __maybe_unused __attribute__((unused)) #define __maybe_unused __attribute__((unused))
#define __always_unused __attribute__((unused))
#define __gcc_header(x) #x #define __gcc_header(x) #x
#define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h) #define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h)

4
include/linux/compiler.h
View file

@ -213,6 +213,10 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
# define __maybe_unused /* unimplemented */ # define __maybe_unused /* unimplemented */
#endif #endif
#ifndef __always_unused
# define __always_unused /* unimplemented */
#endif
#ifndef noinline #ifndef noinline
#define noinline #define noinline
#endif #endif