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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
