linux-kernel - [tip:locking/urgent] locking/pvqspinlock/x86: Use LOCK_PREFIX in __pv_queued_spin

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Date:   Wed, 25 Jul 2018 07:20:05 -0700
From:   tip-bot for Waiman Long <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, jmario@...hat.com, peterz@...radead.org,
        torvalds@...ux-foundation.org, longman@...hat.com,
        tglx@...utronix.de, will.deacon@....com,
        linux-kernel@...r.kernel.org, hpa@...or.com
Subject: [tip:locking/urgent] locking/pvqspinlock/x86: Use LOCK_PREFIX in
 __pv_queued_spin_unlock() assembly code

Commit-ID:  c0dc373a780f4ec63e45a573b9551763abd8cd1a
Gitweb:     https://git.kernel.org/tip/c0dc373a780f4ec63e45a573b9551763abd8cd1a
Author:     Waiman Long <longman@...hat.com>
AuthorDate: Tue, 17 Jul 2018 16:16:00 -0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 25 Jul 2018 11:22:20 +0200

locking/pvqspinlock/x86: Use LOCK_PREFIX in __pv_queued_spin_unlock() assembly code

The LOCK_PREFIX macro should be used in the __raw_callee_save___pv_queued_spin_unlock()
assembly code, so that the lock prefix can be patched out on UP systems.

Signed-off-by: Waiman Long <longman@...hat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Joe Mario <jmario@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will.deacon@....com>
Link: http://lkml.kernel.org/r/1531858560-21547-1-git-send-email-longman@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/qspinlock_paravirt.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/qspinlock_paravirt.h b/arch/x86/include/asm/qspinlock_paravirt.h
index 9ef5ee03d2d7..159622ee0674 100644
--- a/arch/x86/include/asm/qspinlock_paravirt.h
+++ b/arch/x86/include/asm/qspinlock_paravirt.h
@@ -43,7 +43,7 @@ asm    (".pushsection .text;"
 	"push  %rdx;"
 	"mov   $0x1,%eax;"
 	"xor   %edx,%edx;"
-	"lock cmpxchg %dl,(%rdi);"
+	LOCK_PREFIX "cmpxchg %dl,(%rdi);"
 	"cmp   $0x1,%al;"
 	"jne   .slowpath;"
 	"pop   %rdx;"