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authorMichael Mueller <mimu@linux.vnet.ibm.com>2017-11-20 10:37:30 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2018-01-16 16:15:18 +0100
commit588629385c4b96c436cef55dff75eef7f90cd5f0 (patch)
treec93a064c8de15ecd939d74e708010958a5ff7074 /arch/s390/kvm/interrupt.c
parent2f8311c912ab67084ce3657096df601c87f49a58 (diff)
KVM: s390: drop use of spin lock in __floating_irq_kick
It is not required to take to a lock to protect access to the cpuflags of the local interrupt structure of a vcpu as the performed operation is an atomic_or. Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/interrupt.c')
-rw-r--r--arch/s390/kvm/interrupt.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 024ad8bcc516..818aa4248b0f 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -1569,7 +1569,6 @@ static void __floating_irq_kick(struct kvm *kvm, u64 type)
/* make the VCPU drop out of the SIE, or wake it up if sleeping */
li = &dst_vcpu->arch.local_int;
- spin_lock(&li->lock);
switch (type) {
case KVM_S390_MCHK:
atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
@@ -1581,7 +1580,6 @@ static void __floating_irq_kick(struct kvm *kvm, u64 type)
atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
break;
}
- spin_unlock(&li->lock);
kvm_s390_vcpu_wakeup(dst_vcpu);
}