linux-kernel - [tip:locking/core] locking/core, s390: Make cpu

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Message-ID: <tip-22b6430d36659b37ed139b7fd87fcc7237fb0cfd@git.kernel.org>
Date:   Wed, 16 Nov 2016 04:09:59 -0800
From:   tip-bot for Christian Borntraeger <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, npiggin@...il.com,
        will.deacon@....com, torvalds@...ux-foundation.org,
        heiko.carstens@...ibm.com, schwidefsky@...ibm.com,
        peterz@...radead.org, borntraeger@...ibm.com,
        catalin.marinas@....com, mingo@...nel.org, linux@...linux.org.uk,
        tglx@...utronix.de, noamc@...hip.com, hpa@...or.com
Subject: [tip:locking/core] locking/core, s390: Make cpu_relax() a barrier
 again

Commit-ID:  22b6430d36659b37ed139b7fd87fcc7237fb0cfd
Gitweb:     http://git.kernel.org/tip/22b6430d36659b37ed139b7fd87fcc7237fb0cfd
Author:     Christian Borntraeger <borntraeger@...ibm.com>
AuthorDate: Tue, 25 Oct 2016 11:03:13 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 16 Nov 2016 10:15:10 +0100

locking/core, s390: Make cpu_relax() a barrier again

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@...ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Noam Camus <noamc@...hip.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Russell King <linux@...linux.org.uk>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will.deacon@....com>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: virtualization@...ts.linux-foundation.org
Cc: xen-devel@...ts.xenproject.org
Link: http://lkml.kernel.org/r/1477386195-32736-4-git-send-email-borntraeger@de.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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 5bb4433..79343e3 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