From 681405bfc73a2717ae9b03b2bad465b009106f31 Mon Sep 17 00:00:00 2001 From: Jan Kiszka Date: Tue, 9 Jun 2009 15:37:03 +0200 Subject: [PATCH] KVM: Drop useless atomic test from timer function The current code tries to optimize the setting of KVM_REQ_PENDING_TIMER but used atomic_inc_and_test - which always returns true unless pending had the invalid value of -1 on entry. This patch drops the test part preserving the original semantic but expressing it less confusingly. Signed-off-by: Jan Kiszka Signed-off-by: Avi Kivity --- arch/x86/kvm/timer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/timer.c b/arch/x86/kvm/timer.c index 1baed41..eea4043 100644 --- a/arch/x86/kvm/timer.c +++ b/arch/x86/kvm/timer.c @@ -15,9 +15,9 @@ static int __kvm_timer_fn(struct kvm_vcpu *vcpu, struct kvm_timer *ktimer) * case anyway. */ if (ktimer->reinject || !atomic_read(&ktimer->pending)) { + atomic_inc(&ktimer->pending); /* FIXME: this code should not know anything about vcpus */ - if (!atomic_inc_and_test(&ktimer->pending)) - set_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests); + set_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests); } if (waitqueue_active(q)) -- 2.7.4