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

Message ID 20170913200824.28067-4-dave@stgolabs.net (mailing list archive)
State New, archived
Headers show

Commit Message

Davidlohr Bueso Sept. 13, 2017, 8:08 p.m. UTC 
A comment might serve future readers.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
---
 arch/x86/kvm/lapic.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

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);