linux-kernel - [PATCH] x86/pvqspinlock: Use LOCK_PREFIX in __pv_queued_spin

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Date:   Tue, 17 Jul 2018 16:16:00 -0400
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Will Deacon <will.deacon@....com>,
        Joe Mario <jmario@...hat.com>, Waiman Long <longman@...hat.com>
Subject: [PATCH] x86/pvqspinlock: Use LOCK_PREFIX in __pv_queued_spin_unlock assembly code

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

Signed-off-by: Waiman Long <longman@...hat.com>
---
 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 9ef5ee0..159622e 100644
--- a/arch/x86/include/asm/qspinlock_paravirt.h
+++ b/arch/x86/include/asm/qspinlock_paravirt.h
@@ -43,7 +43,7 @@
 	"push  %rdx;"
 	"mov   $0x1,%eax;"
 	"xor   %edx,%edx;"
-	"lock cmpxchg %dl,(%rdi);"
+	LOCK_PREFIX "cmpxchg %dl,(%rdi);"
 	"cmp   $0x1,%al;"
 	"jne   .slowpath;"
 	"pop   %rdx;"
-- 
1.8.3.1