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powerpc: Add attributes for setjmp/longjmp

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commit aa497d4352 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>
This commit is contained in:
Segher Boessenkool
2019-09-04 14:11:07 +00:00
committed by Greg Kroah-Hartman
parent 3851b89b88
commit 303b647b8e
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/include/asm/setjmp.h
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@@ -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 */