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Diffstat (limited to 'arch/s390/kvm/interrupt.c')
| -rw-r--r-- | arch/s390/kvm/interrupt.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index a832ad031cee..23d8fb25c5dd 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -1074,6 +1074,12 @@ void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu) * in kvm_vcpu_block without having the waitqueue set (polling) */ vcpu->valid_wakeup = true; + /* + * This is mostly to document, that the read in swait_active could + * be moved before other stores, leading to subtle races. + * All current users do not store or use an atomic like update + */ + smp_mb__after_atomic(); if (swait_active(&vcpu->wq)) { /* * The vcpu gave up the cpu voluntarily, mark it as a good |