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Date: Mon, 15 Sep 2014 12:24:16 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Christian Borntraeger <borntraeger@...ibm.com>, Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Heiko Carstens <heiko.carstens@...ibm.com>, Martin Schwidefsky <schwidefsky@...ibm.com> Subject: [PATCH 3.16 017/158] s390/locking: Reenable optimistic spinning 3.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christian Borntraeger <borntraeger@...ibm.com> commit 36e7fdaa1a04fcf65b864232e1af56a51c7814d6 upstream. 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@...ibm.com> Cc: Ingo Molnar <mingo@...nel.org> Cc: Peter Zijlstra <peterz@...radead.org> Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/s390/Kconfig | 1 + 1 file changed, 1 insertion(+) --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -92,6 +92,7 @@ config S390 select ARCH_INLINE_WRITE_UNLOCK_IRQ select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE select ARCH_SAVE_PAGE_KEYS if HIBERNATION + select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_USE_CMPXCHG_LOCKREF select ARCH_WANT_IPC_PARSE_VERSION select BUILDTIME_EXTABLE_SORT -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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