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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2009-06-09 15:37:03 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-09-10 08:32:57 +0300 |
| commit | 681405bfc73a2717ae9b03b2bad465b009106f31 (patch) | |
| tree | 4b6d8a726a200f188434487f32fe6b29aa38e624 /arch | |
| parent | f7104db26ab2bc5f642892774ac8fb0f15400969 (diff) | |
| download | blackbird-op-linux-681405bfc73a2717ae9b03b2bad465b009106f31.tar.gz blackbird-op-linux-681405bfc73a2717ae9b03b2bad465b009106f31.zip | |
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 <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/timer.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/timer.c b/arch/x86/kvm/timer.c index 1baed414b57a..eea40439066c 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)) |
