Messages in this thread Patch in this message | | | Date | Mon, 02 Nov 2009 08:50:52 +0800 | From | Li Zefan <> | Subject | [PATCH 1/2] 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> --- include/linux/compiler-gcc.h | 1 + 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 a3ed7cb..73dcf80 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 d1cc9f0..1ccebf4 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -132,6 +132,10 @@ extern void __chk_io_ptr(const volatile void __iomem *); # define __maybe_unused /* unimplemented */ #endif +#ifndef __always_unused +# define __always_unused /* unimplemented */ +#endif + #ifndef noinline #define noinline #endif -- 1.6.3
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