From: Segher Boessenkool Date: Wed, 4 Sep 2019 14:11:07 +0000 (+0000) Subject: powerpc: Add attributes for setjmp/longjmp X-Git-Tag: v5.15~5474^2~60 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=aa497d4352414aad22e792b35d0aaaa12bbc37c5;p=platform%2Fkernel%2Flinux-starfive.git powerpc: Add attributes for setjmp/longjmp The setjmp function should be declared as "returns_twice", or bad things can happen[1]. This does not actually change generated code in my testing. The longjmp function should be declared as "noreturn", so that the compiler can optimise calls to it better. This makes the generated code a little shorter. 1: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-returns_005ftwice-function-attribute Signed-off-by: Segher Boessenkool Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/c02ce4a573f3bac907e2c70957a2d1275f910013.1567605586.git.segher@kernel.crashing.org --- diff --git a/arch/powerpc/include/asm/setjmp.h b/arch/powerpc/include/asm/setjmp.h index d995061..e9f81bb 100644 --- a/arch/powerpc/include/asm/setjmp.h +++ b/arch/powerpc/include/asm/setjmp.h @@ -7,7 +7,7 @@ #define JMP_BUF_LEN 23 -extern long setjmp(long *); -extern void longjmp(long *, long); +extern long setjmp(long *) __attribute__((returns_twice)); +extern void longjmp(long *, long) __attribute__((noreturn)); #endif /* _ASM_POWERPC_SETJMP_H */