| commit | a0cff57bb2a41cb9cbf13d3203097b4156d8c0ae | [log] [tgz] |
|---|---|---|
| author | Davidlohr Bueso <dave@stgolabs.net> | Wed Sep 13 13:08:21 2017 -0700 |
| committer | Paolo Bonzini <pbonzini@redhat.com> | Fri Sep 15 16:57:12 2017 +0200 |
| tree | db128f5fac2c228a01f314174b20db01b3412316 | |
| parent | cc1b46803a671047be22f7832ef4a2bb3f63dd94 [diff] |
kvm,x86: Fix apf_task_wake_one() wq serialization During code inspection, the following potential race was seen: CPU0 CPU1 kvm_async_pf_task_wait apf_task_wake_one [L] swait_active(&n->wq) [S] prepare_to_swait(&n.wq) [L] if (!hlist_unhahed(&n.link)) schedule() [S] hlist_del_init(&n->link); Properly serialize swait_active() checks such that a wakeup is not missed. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>