diff options
| author | Thomas Gleixner <[email protected]> | 2008-11-24 19:54:37 +0100 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2008-11-24 19:54:37 +0100 |
| commit | 3e1d7a6219ab64e13b10b1a77c0625db9a8bd8db (patch) | |
| tree | c682da7317845d7b1336e3d8498cf83bdf8f5900 /include/linux/compiler.h | |
| parent | 42569c39917a08e8de1e8b5685463be7b74baebd (diff) | |
| parent | 13d428afc007fcfcd6deeb215618f54cf9c0cae6 (diff) | |
Merge branch 'linus' into core/futexes
Diffstat (limited to 'include/linux/compiler.h')
| -rw-r--r-- | include/linux/compiler.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index c8bd2daf95ec..98115d9d04da 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -44,6 +44,8 @@ extern void __chk_io_ptr(const volatile void __iomem *); # error Sorry, your compiler is too old/not recognized. #endif +#define notrace __attribute__((no_instrument_function)) + /* Intel compiler defines __GNUC__. So we will overwrite implementations * coming from above header files here */ @@ -190,7 +192,9 @@ extern void __chk_io_ptr(const volatile void __iomem *); * ACCESS_ONCE() in different C statements. * * This macro does absolutely -nothing- to prevent the CPU from reordering, - * merging, or refetching absolutely anything at any time. + * merging, or refetching absolutely anything at any time. Its main intended + * use is to mediate communication between process-level code and irq/NMI + * handlers, all running on the same CPU. */ #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) |