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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2012-05-14 12:41:54 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-05-16 14:42:45 +0200 |
| commit | e5b8d7553f87d939295e9eb0ca699c0030dc5ff1 (patch) | |
| tree | 0b0586194a47d11ab07bd09bea2bdf692a2a9a44 /arch/s390 | |
| parent | s390/barrier: cleanup barrier functions (diff) | |
| download | linux-e5b8d7553f87d939295e9eb0ca699c0030dc5ff1.tar.xz linux-e5b8d7553f87d939295e9eb0ca699c0030dc5ff1.zip | |
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>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/barrier.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/s390/include/asm/barrier.h b/arch/s390/include/asm/barrier.h index 6993b20d64fb..10a508802940 100644 --- a/arch/s390/include/asm/barrier.h +++ b/arch/s390/include/asm/barrier.h @@ -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() |