diff options
| author | Michael Mueller <mimu@linux.vnet.ibm.com> | 2017-11-20 10:37:30 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2018-01-16 16:15:18 +0100 |
| commit | 588629385c4b96c436cef55dff75eef7f90cd5f0 (patch) | |
| tree | c93a064c8de15ecd939d74e708010958a5ff7074 | |
| parent | KVM: s390: add debug tracing for cpu features of CPU model (diff) | |
| download | linux-588629385c4b96c436cef55dff75eef7f90cd5f0.tar.xz linux-588629385c4b96c436cef55dff75eef7f90cd5f0.zip | |
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>
| -rw-r--r-- | arch/s390/kvm/interrupt.c | 2 |
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); } |