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[4/4] KVM: Reduce atomic operations on vcpu->requests

Message ID 1277050918-12744-5-git-send-email-avi@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Avi Kivity June 20, 2010, 4:21 p.m. UTC 
None
diff mbox

Patch

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index e706c1e..e478f3f 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -642,7 +642,12 @@  static inline bool kvm_make_check_request(int req, struct kvm_vcpu *vcpu)
 
 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
 {
-	return test_and_clear_bit(req, &vcpu->requests);
+	if (test_bit(req, &vcpu->requests)) {
+		clear_bit(req, &vcpu->requests);
+		return true;
+	} else {
+		return false;
+	}
 }
 
 #endif