linux-kernel - [PATCH] kvm/s390: drop unpaired smp

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Message-ID: <1452010811-25486-1-git-send-email-mst@redhat.com>
Date:	Tue, 5 Jan 2016 18:20:24 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	kvm@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH] kvm/s390: drop unpaired smp_mb

smp_mb on vcpu destroy isn't paired with anything, violating pairing
rules, and seems to be useless.

Drop it.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---

Untested.

 arch/s390/kvm/kvm-s390.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 8465892..7305d2c 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1195,7 +1195,6 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 		    (__u64) vcpu->arch.sie_block)
 			vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
 	}
-	smp_mb();
 
 	if (kvm_is_ucontrol(vcpu->kvm))
 		gmap_free(vcpu->arch.gmap);
-- 
MST
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