Messages in this thread Patch in this message | | | From | Waiman Long <> | Subject | [PATCH] x86/pvqspinlock: Use LOCK_PREFIX in __pv_queued_spin_unlock assembly code | Date | Tue, 17 Jul 2018 16:16:00 -0400 |
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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@redhat.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
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