diff options
| author | Andrey Smetanin <asmetanin@virtuozzo.com> | 2015-10-16 10:07:45 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-10-16 11:34:28 +0300 |
| commit | 351dc6477cd35136ce4668401b1b1332a62908a8 (patch) | |
| tree | 909d643640eeb91f7312572074681d915138febc /virt/kvm/eventfd.c | |
| parent | 7cae2bedcbd4680b155999655e49c27b9cf020fa (diff) | |
| download | linux-351dc6477cd35136ce4668401b1b1332a62908a8.tar.xz | |
kvm/eventfd: avoid loop inside irqfd_update()
The loop(for) inside irqfd_update() is unnecessary
because any other value for irq_entry.type will just trigger
schedule_work(&irqfd->inject) in irqfd_wakeup.
Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Vitaly Kuznetsov <vkuznets@redhat.com>
CC: "K. Y. Srinivasan" <kys@microsoft.com>
CC: Gleb Natapov <gleb@kernel.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/eventfd.c')
| -rw-r--r-- | virt/kvm/eventfd.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index b637965746bb..518421e65b0d 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -238,20 +238,17 @@ static void irqfd_update(struct kvm *kvm, struct kvm_kernel_irqfd *irqfd) { struct kvm_kernel_irq_routing_entry *e; struct kvm_kernel_irq_routing_entry entries[KVM_NR_IRQCHIPS]; - int i, n_entries; + int n_entries; n_entries = kvm_irq_map_gsi(kvm, entries, irqfd->gsi); write_seqcount_begin(&irqfd->irq_entry_sc); - irqfd->irq_entry.type = 0; - e = entries; - for (i = 0; i < n_entries; ++i, ++e) { - /* Only fast-path MSI. */ - if (e->type == KVM_IRQ_ROUTING_MSI) - irqfd->irq_entry = *e; - } + if (n_entries == 1) + irqfd->irq_entry = *e; + else + irqfd->irq_entry.type = 0; write_seqcount_end(&irqfd->irq_entry_sc); } |