diff options
| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-08-05 03:57:51 -0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-08-06 05:44:43 -0400 |
| commit | 36e7fdaa1a04fcf65b864232e1af56a51c7814d6 (patch) | |
| tree | fdc1603d6ea44a5c9033f4d1804d982e23708b71 /arch/s390/Kconfig | |
| parent | 152125b7a882df36a55a8eadbea6d0edf1461ee7 (diff) | |
s390/locking: Reenable optimistic spinning
commit 4badad352a6bb202ec68afa7a574c0bb961e5ebc (locking/mutex: Disable
optimistic spinning on some architectures) fenced spinning for
architectures without proper cmpxchg.
There is no need to disable mutex spinning on s390, though:
The instructions CS,CSG and friends provide the proper guarantees.
(We dont implement cmpxchg with locks).
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index bb63499fc5d3..9f00f9301613 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig | |||
| @@ -92,6 +92,7 @@ config S390 | |||
| 92 | select ARCH_INLINE_WRITE_UNLOCK_IRQ | 92 | select ARCH_INLINE_WRITE_UNLOCK_IRQ |
| 93 | select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE | 93 | select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE |
| 94 | select ARCH_SAVE_PAGE_KEYS if HIBERNATION | 94 | select ARCH_SAVE_PAGE_KEYS if HIBERNATION |
| 95 | select ARCH_SUPPORTS_ATOMIC_RMW | ||
| 95 | select ARCH_USE_CMPXCHG_LOCKREF | 96 | select ARCH_USE_CMPXCHG_LOCKREF |
| 96 | select ARCH_WANT_IPC_PARSE_VERSION | 97 | select ARCH_WANT_IPC_PARSE_VERSION |
| 97 | select BUILDTIME_EXTABLE_SORT | 98 | select BUILDTIME_EXTABLE_SORT |