* [PATCH 3/3] kvmppc: optimize find first bit
@ 2008-10-10 10:59 ehrhardt
2008-10-10 18:23 ` Hollis Blanchard
2008-10-13 12:07 ` ehrhardt
0 siblings, 2 replies; 3+ messages in thread
From: ehrhardt @ 2008-10-10 10:59 UTC (permalink / raw)
To: kvm-ppc
From: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Since we use a unsigned long here anyway we can use the optimized __ffs.
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
---
[diffstat]
[diff]
diff --git a/arch/powerpc/kvm/booke_guest.c b/arch/powerpc/kvm/booke_guest.c
--- a/arch/powerpc/kvm/booke_guest.c
+++ b/arch/powerpc/kvm/booke_guest.c
@@ -227,7 +227,7 @@
unsigned long *pending = &vcpu->arch.pending_exceptions;
unsigned int priority;
- priority = find_first_bit(pending, BITS_PER_BYTE * sizeof(*pending));
+ priority = __ffs(*pending);
while (priority <= BOOKE_MAX_INTERRUPT) {
if (kvmppc_can_deliver_interrupt_by_prio(vcpu, priority)) {
kvmppc_clear_exception_by_prio(pending, priority);
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH 3/3] kvmppc: optimize find first bit
2008-10-10 10:59 [PATCH 3/3] kvmppc: optimize find first bit ehrhardt
@ 2008-10-10 18:23 ` Hollis Blanchard
2008-10-13 12:07 ` ehrhardt
1 sibling, 0 replies; 3+ messages in thread
From: Hollis Blanchard @ 2008-10-10 18:23 UTC (permalink / raw)
To: kvm-ppc
On Fri, 2008-10-10 at 12:59 +0200, ehrhardt@linux.vnet.ibm.com wrote:
> From: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
>
> Since we use a unsigned long here anyway we can use the optimized __ffs.
Looks good.
--
Hollis Blanchard
IBM Linux Technology Center
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH 3/3] kvmppc: optimize find first bit
2008-10-10 10:59 [PATCH 3/3] kvmppc: optimize find first bit ehrhardt
2008-10-10 18:23 ` Hollis Blanchard
@ 2008-10-13 12:07 ` ehrhardt
1 sibling, 0 replies; 3+ messages in thread
From: ehrhardt @ 2008-10-13 12:07 UTC (permalink / raw)
To: kvm-ppc
From: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Since we use a unsigned long here anyway we can use the optimized __ffs.
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
---
[diffstat]
booke_guest.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
[diff]
diff --git a/arch/powerpc/kvm/booke_guest.c b/arch/powerpc/kvm/booke_guest.c
--- a/arch/powerpc/kvm/booke_guest.c
+++ b/arch/powerpc/kvm/booke_guest.c
@@ -180,7 +180,7 @@
unsigned int prio;
u32 mask;
- prio = find_first_bit(pending, BITS_PER_BYTE * sizeof(*pending));
+ prio = __ffs(*pending);
while (prio <= BOOKE_MAX_INTERRUPT) {
if (kvmppc_can_deliver_interrupt_by_prio(vcpu, prio, &mask)) {
kvmppc_clear_exception_by_prio(pending, prio);
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2008-10-13 12:07 UTC | newest]
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2008-10-10 10:59 [PATCH 3/3] kvmppc: optimize find first bit ehrhardt
2008-10-10 18:23 ` Hollis Blanchard
2008-10-13 12:07 ` ehrhardt
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