[PATCH 3/7] kvm,lapic: Justify use of swait_activate()

[Davidlohr Bueso]

A comment might serve future readers.

Signed-off-by: Davidlohr Bueso <dbu...@suse.de>
---
 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);
 
-- 
2.12.0