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[5/8] KVM: s390: Allow NULL parameter for kvm_s390_get_regs_rre

Message ID 1378974829-46578-6-git-send-email-borntraeger@de.ibm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Christian Borntraeger Sept. 12, 2013, 8:33 a.m. UTC 
From: Thomas Huth <thuth@linux.vnet.ibm.com>

We're not always interested in both registers that are specified
for an RRE instruction. So allow NULL as parameter, too, to indicate
that we do not need the corresponding value.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
 arch/s390/kvm/kvm-s390.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index a307a85..b44912a 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -90,8 +90,10 @@  static inline void kvm_s390_get_base_disp_sse(struct kvm_vcpu *vcpu,
 
 static inline void kvm_s390_get_regs_rre(struct kvm_vcpu *vcpu, int *r1, int *r2)
 {
-	*r1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 20;
-	*r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
+	if (r1)
+		*r1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 20;
+	if (r2)
+		*r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
 }
 
 static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu)