From cc1b46803a671047be22f7832ef4a2bb3f63dd94 Mon Sep 17 00:00:00 2001 From: Davidlohr Bueso Date: Wed, 13 Sep 2017 13:08:20 -0700 Subject: [PATCH] kvm,lapic: Justify use of swait_active() A comment might serve future readers. Signed-off-by: Davidlohr Bueso Signed-off-by: Paolo Bonzini --- arch/x86/kvm/lapic.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index aaf10b6f5380..69c5612be786 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1324,6 +1324,10 @@ static void apic_timer_expired(struct kvm_lapic *apic) atomic_inc(&apic->lapic_timer.pending); kvm_set_pending_timer(vcpu); + /* + * For x86, the atomic_inc() is serialized, thus + * using swait_active() is safe. + */ if (swait_active(q)) swake_up(q); -- 2.20.1