From 0d7ebbbc6eaa5539f78ab20ed6ff1725a4e332ef Mon Sep 17 00:00:00 2001 From: David Rientjes Date: Wed, 9 May 2007 02:35:27 -0700 Subject: compiler: introduce __used and __maybe_unused __used is defined to be __attribute__((unused)) for all pre-3.3 gcc compilers to suppress warnings for unused functions because perhaps they are referenced only in inline assembly. It is defined to be __attribute__((used)) for gcc 3.3 and later so that the code is still emitted for such functions. __maybe_unused is defined to be __attribute__((unused)) for both function and variable use if it could possibly be unreferenced due to the evaluation of preprocessor macros. Function prototypes shall be marked with __maybe_unused if the actual definition of the function is dependant on preprocessor macros. No update to compiler-intel.h is necessary because ICC supports both __attribute__((used)) and __attribute__((unused)) as specified by the gcc manual. __attribute_used__ is deprecated and will be removed once all current code is converted to using __used. Cc: Rusty Russell Cc: Adrian Bunk Signed-off-by: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/compiler-gcc3.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'include/linux/compiler-gcc3.h') diff --git a/include/linux/compiler-gcc3.h b/include/linux/compiler-gcc3.h index ecd621fd27d2..a9e2863c2dbf 100644 --- a/include/linux/compiler-gcc3.h +++ b/include/linux/compiler-gcc3.h @@ -4,9 +4,11 @@ #include #if __GNUC_MINOR__ >= 3 -# define __attribute_used__ __attribute__((__used__)) +# define __used __attribute__((__used__)) +# define __attribute_used__ __used /* deprecated */ #else -# define __attribute_used__ __attribute__((__unused__)) +# define __used __attribute__((__unused__)) +# define __attribute_used__ __used /* deprecated */ #endif #if __GNUC_MINOR__ >= 4 -- cgit v1.2.3