From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arch@vger.kernel.org,
linux-s390 <linux-s390@vger.kernel.org>,
kvm@vger.kernel.org, Will Deacon <will.deacon@arm.com>,
x86@kernel.org, Heiko Carstens <heiko.carstens@de.ibm.com>,
linux-kernel@vger.kernel.org, Nicholas Piggin <npiggin@gmail.com>,
Russell King <linux@armlinux.org.uk>,
sparclinux@vger.kernel.org, Noam Camus <noamc@ezchip.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
xen-devel@lists.xenproject.org,
virtualization@lists.linux-foundation.org,
linuxppc-dev@lists.ozlabs.org, Ingo Molnar <mingo@kernel.org>
Subject: [GIT PULL v2 3/5] s390: make cpu_relax a barrier again
Date: Tue, 25 Oct 2016 11:03:13 +0200 [thread overview]
Message-ID: <1477386195-32736-4-git-send-email-borntraeger@de.ibm.com> (raw)
In-Reply-To: <1477386195-32736-1-git-send-email-borntraeger@de.ibm.com>
stop_machine seemed to be the only important place for yielding during
cpu_relax. This was fixed by using cpu_relax_yield. Therefore, we can
now redefine cpu_relax to be a barrier instead on s390, making s390
identical to all other architectures.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
arch/s390/include/asm/processor.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index d05965b..5d262cf 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -236,7 +236,7 @@ static inline unsigned short stap(void)
*/
void cpu_relax_yield(void);
-#define cpu_relax() cpu_relax_yield()
+#define cpu_relax() barrier()
#define cpu_relax_lowlatency() barrier()
#define ECAG_CACHE_ATTRIBUTE 0
--
2.5.5
next prev parent reply other threads:[~2016-10-25 9:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-25 9:03 [GIT PULL v2 0/5] cpu_relax: drop lowlatency, introduce yield Christian Borntraeger
2016-10-25 9:03 ` [GIT PULL v2 1/5] processor.h: introduce cpu_relax_yield Christian Borntraeger
2016-11-15 12:30 ` Russell King - ARM Linux
2016-11-15 13:19 ` Christian Borntraeger
2016-11-15 13:37 ` Russell King - ARM Linux
2016-11-15 13:52 ` Christian Borntraeger
2016-10-25 9:03 ` [GIT PULL v2 2/5] stop_machine: yield CPU during stop machine Christian Borntraeger
2016-10-25 9:03 ` Christian Borntraeger [this message]
2016-10-25 9:03 ` [GIT PULL v2 4/5] processor.h: Remove cpu_relax_lowlatency users Christian Borntraeger
2016-10-25 9:03 ` [GIT PULL v2 5/5] processor.h: remove cpu_relax_lowlatency Christian Borntraeger
2016-11-15 10:15 ` [GIT PULL v2 0/5] cpu_relax: drop lowlatency, introduce yield Christian Borntraeger
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