linux-kernel - [PATCH 04/44] KVM: ppc: optimize find first bit

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Message-Id: <1228854179-23002-5-git-send-email-avi@redhat.com>
Date:	Tue,  9 Dec 2008 22:22:19 +0200
From:	Avi Kivity <avi@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Hollis Blanchard <hollisb@...ibm.com>
Subject: [PATCH 04/44] KVM: ppc: optimize find first bit

From: Hollis Blanchard <hollisb@...ibm.com>

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

Signed-off-by: Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@...ibm.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
---
 arch/powerpc/kvm/booke.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index b285e3d..0f06471 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)) {
-- 
1.6.0.3

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