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Commit e5b8d755 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent c6f48b0b

arch/s390/include/asm/barrier.h

+5 −0
Original line number Diff line number Diff line
@@ -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()