Messages in this thread Patch in this message | | | From | Heiko Carstens <> | Subject | [PATCH/RFC 2/3] ftrace: introduce nohotpatch function attribute | Date | Mon, 26 Jan 2015 13:54:53 +0100 |
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gcc supports an s390 specific function attribute called "hotpatch". It can be used to specify the number of halfwords that shall be added before and after a function that shall be filled with nops for runtime patching.
s390 will use the hotpatch attribute for function tracing, therefore introduce a nohotpatch define, depending on CC_USING_HOTPATCH, and add it to the existing notrace define.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> --- include/linux/compiler.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index b4fd7013c9f4..b4ab98e0e10b 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -54,7 +54,13 @@ extern void __chk_io_ptr(const volatile void __iomem *); #include <linux/compiler-gcc.h> #endif -#define notrace __attribute__((no_instrument_function)) +#ifdef CC_USING_HOTPATCH +#define nohotpatch __attribute__((hotpatch(0,0))) +#else +#define nohotpatch +#endif + +#define notrace __attribute__((no_instrument_function)) nohotpatch /* Intel compiler defines __GNUC__. So we will overwrite implementations * coming from above header files here -- 2.1.4
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