Commits
Davidlohr Bueso committed 4c0b4bc60f9
kvm,mips: Fix potential swait_active() races
For example, the following could occur, making us miss a wakeup:
CPU0 CPU1
kvm_vcpu_block kvm_mips_comparecount_func
[L] swait_active(&vcpu->wq)
[S] prepare_to_swait(&vcpu->wq)
[L] if (!kvm_vcpu_has_pending_timer(vcpu))
schedule() [S] queue_timer_int(vcpu)
Ensure that the swait_active() check is not hoisted over the interrupt.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>