[PATCH v2 5/5] KVM: optimize kvm_make_all_cpus_request

[Radim Krčmář]

Use __kvm_request_set to avoid repeated use of wmb().
kvm_make_all_cpus_request is also a candidate for renaming.

Signed-off-by: Radim Krčmář <rkrc...@redhat.com>
---
 virt/kvm/kvm_main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 0ee1df3bfcb8..eaab32349664 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -177,8 +177,12 @@ bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned 
int req)
        zalloc_cpumask_var(&cpus, GFP_ATOMIC);
 
        me = get_cpu();
+
+       /* Paired with the smp_mb__after_atomic in kvm_request_test_and_clear. 
*/
+       smp_wmb();
+
        kvm_for_each_vcpu(i, vcpu, kvm) {
-               kvm_request_set(req, vcpu);
+               __kvm_request_set(req, vcpu);
                cpu = vcpu->cpu;
 
                /* Set ->requests bit before we read ->mode. */
-- 
2.11.1