From: Hollis Blanchard <hollisb@us.ibm.com>
Date: Wed, 5 Nov 2008 15:36:22 +0000 (-0600)
Subject: KVM: ppc: optimize find first bit
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9ab80843c01ac25139e635d018467e528729a317;p=linux-beck.git

KVM: ppc: optimize find first bit

Since we use a unsigned long here anyway we can use the optimized __ffs.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index b285e3d32466..0f064719162c 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -222,7 +222,7 @@ void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
 	unsigned int exception;
 	unsigned int priority;
 
-	priority = find_first_bit(pending, BITS_PER_BYTE * sizeof(*pending));
+	priority = __ffs(*pending);
 	while (priority <= BOOKE_MAX_INTERRUPT) {
 		exception = priority_exception[priority];
 		if (kvmppc_can_deliver_interrupt(vcpu, exception)) {