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| author | Segher Boessenkool <segher@kernel.crashing.org> | 2019-09-04 16:11:07 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-09-12 01:26:59 +0200 |
| commit | aa497d4352414aad22e792b35d0aaaa12bbc37c5 (patch) | |
| tree | 46b5cfdf13e84a6e0736d3be958548fc1ff29e40 /arch/powerpc/include | |
| parent | powerpc: Remove empty comment (diff) | |
| download | linux-aa497d4352414aad22e792b35d0aaaa12bbc37c5.tar.xz linux-aa497d4352414aad22e792b35d0aaaa12bbc37c5.zip | |
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 <segher@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c02ce4a573f3bac907e2c70957a2d1275f910013.1567605586.git.segher@kernel.crashing.org
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/setjmp.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/setjmp.h b/arch/powerpc/include/asm/setjmp.h index d995061f5f86..e9f81bb3f83b 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 */ |