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| author | Heiko Carstens | 2011-05-23 10:24:32 +0200 |
|---|---|---|
| committer | Martin Schwidefsky | 2011-05-23 10:24:29 +0200 |
| commit | 4c2241fd42298007d7c3a92318806a4a9490a93c (patch) | |
| tree | 13e9af56e8f0badae7c8a238901e542163c115e2 /arch/s390/include/asm/cmpxchg.h | |
| parent | [S390] vdso: disable gcov profiling (diff) | |
| download | kernel-qcow2-linux-4c2241fd42298007d7c3a92318806a4a9490a93c.tar.gz kernel-qcow2-linux-4c2241fd42298007d7c3a92318806a4a9490a93c.tar.xz kernel-qcow2-linux-4c2241fd42298007d7c3a92318806a4a9490a93c.zip | |
[S390] percpu: implement arch specific irqsafe_cpu_ops
Implement arch specific irqsafe_cpu ops. The arch specific ops do not
disable/enable interrupts since that is an expensive operation. Instead
we disable preemption and perform a compare and swap loop.
Since on server distros (the ones we care about) preemption is disabled
the preempt_disable()/preempt_enable() pair is a nop.
In the end this code should be faster than the generic one.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/cmpxchg.h')
| -rw-r--r-- | arch/s390/include/asm/cmpxchg.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/s390/include/asm/cmpxchg.h b/arch/s390/include/asm/cmpxchg.h index 7488e52efa97..81d7908416cf 100644 --- a/arch/s390/include/asm/cmpxchg.h +++ b/arch/s390/include/asm/cmpxchg.h @@ -167,7 +167,6 @@ static inline unsigned long __cmpxchg(void *ptr, unsigned long old, #ifdef CONFIG_64BIT #define cmpxchg64(ptr, o, n) \ ({ \ - BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ cmpxchg((ptr), (o), (n)); \ }) #else /* CONFIG_64BIT */ |