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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>
This commit is contained in:
Michael Mueller 2017-11-20 10:37:30 +01:00 committed by Christian Borntraeger
parent 2f8311c912
commit 588629385c
1 changed files with 0 additions and 2 deletions
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2
arch/s390/kvm/interrupt.c
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@ -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);
}