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| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-11-02 01:50:52 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-11-02 15:47:54 +0100 |
| commit | 7b2a35132ad0a70902dcd2844c27ed64cda0ce9b (patch) | |
| tree | f800a7d536d7850ac5cfeca5eb576f9af568751d | |
| parent | tracing: Exit with error if a weak function is used in recordmcount.pl (diff) | |
| download | linux-7b2a35132ad0a70902dcd2844c27ed64cda0ce9b.tar.xz linux-7b2a35132ad0a70902dcd2844c27ed64cda0ce9b.zip | |
compiler: Introduce __always_unused
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>
| -rw-r--r-- | include/linux/compiler-gcc.h | 1 | ||||
| -rw-r--r-- | include/linux/compiler.h | 4 |
2 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index a3ed7cb8ca34..73dcf804bc94 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -79,6 +79,7 @@ #define noinline __attribute__((noinline)) #define __attribute_const__ __attribute__((__const__)) #define __maybe_unused __attribute__((unused)) +#define __always_unused __attribute__((unused)) #define __gcc_header(x) #x #define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h) diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 04fb5135b4e1..7947f4f6fa51 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -213,6 +213,10 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); # define __maybe_unused /* unimplemented */ #endif +#ifndef __always_unused +# define __always_unused /* unimplemented */ +#endif + #ifndef noinline #define noinline #endif |