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| author | Segher Boessenkool <segher@kernel.crashing.org> | 2019-09-04 17:11:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-17 11:48:53 +0300 |
| commit | 303b647b8e74458fb3ba5bd5c66dedfeb096fa39 (patch) | |
| tree | e62d7df7050329a2e5b3708e50f50a95d07f22be /arch/powerpc/include/asm | |
| parent | 3851b89b88e42d53236c6f332895740feef8ecd4 (diff) | |
| download | linux-303b647b8e74458fb3ba5bd5c66dedfeb096fa39.tar.xz | |
powerpc: Add attributes for setjmp/longjmp
commit aa497d4352414aad22e792b35d0aaaa12bbc37c5 upstream.
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
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc/include/asm')
| -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 279d03a1eec6..d930f5607ef2 100644 --- a/arch/powerpc/include/asm/setjmp.h +++ b/arch/powerpc/include/asm/setjmp.h @@ -12,7 +12,7 @@ #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 */ |