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Commit 7b2a3513 authored by Li Zefan's avatar Li Zefan Committed by Ingo Molnar
Browse files

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: default avatarLi 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: default avatarIngo Molnar <mingo@elte.hu>
parent c4b8ac2c

include/linux/compiler-gcc.h

+1 −0
Original line number Diff line number Diff line
@@ -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)

include/linux/compiler.h

+4 −0
Original line number Diff line number Diff line
@@ -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