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s390/barrier: make use of fast-bcr facility 

If the kernel gets compiled for at least z196, make use of
the fast-BCR facility.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2012-05-14 12:41:54 +02:00 committed by Martin Schwidefsky
parent c6f48b0bbe
commit e5b8d7553f
1 changed files with 5 additions and 0 deletions
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5
arch/s390/include/asm/barrier.h
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@ -15,7 +15,12 @@
static inline void mb(void)
{
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
/* Fast-BCR without checkpoint synchronization */
asm volatile("bcr 14,0" : : : "memory");
#else
asm volatile("bcr 15,0" : : : "memory");
#endif
}
#define rmb() mb()