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| author | Andrew Morton <akpm@linux-foundation.org> | 2015-11-06 16:30:09 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-06 17:50:42 -0800 |
| commit | 9add850c211a39d5ab1a091d48795e21599a73d0 (patch) | |
| tree | cb4b6f94c69f2528ba27880c044677c09b9eecdb /include/linux/compiler-gcc.h | |
| parent | 54708d2858e79a2bdda10bf8a20c80eb96c20613 (diff) | |
| download | lwn-9add850c211a39d5ab1a091d48795e21599a73d0.tar.gz lwn-9add850c211a39d5ab1a091d48795e21599a73d0.zip | |
include/linux/compiler-gcc.h: improve __visible documentation
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/compiler-gcc.h')
| -rw-r--r-- | include/linux/compiler-gcc.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 0e3110a0b771..22ab246feed3 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -205,7 +205,10 @@ #if GCC_VERSION >= 40600 /* - * Tell the optimizer that something else uses this function or variable. + * When used with Link Time Optimization, gcc can optimize away C functions or + * variables which are referenced only from assembly code. __visible tells the + * optimizer that something else uses this function or variable, thus preventing + * this. */ #define __visible __attribute__((externally_visible)) #endif |