linux-kernel - [PATCH] KVM: cleanup kvm_get_dirty

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Date:	Wed, 17 Mar 2010 11:45:04 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	KVM list <kvm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] KVM: cleanup kvm_get_dirty_log()

Using bitmap_empty() to see whether memslot->dirty_bitmap is empty

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 virt/kvm/kvm_main.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index bcd08b8..497ae14 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -767,8 +767,7 @@ int kvm_get_dirty_log(struct kvm *kvm,
 			struct kvm_dirty_log *log, int *is_dirty)
 {
 	struct kvm_memory_slot *memslot;
-	int r, i;
-	int n;
+	int r, n;
 	unsigned long any = 0;
 
 	r = -EINVAL;
@@ -782,8 +781,7 @@ int kvm_get_dirty_log(struct kvm *kvm,
 
 	n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 
-	for (i = 0; !any && i < n/sizeof(long); ++i)
-		any = memslot->dirty_bitmap[i];
+	any = !bitmap_empty(memslot->dirty_bitmap, memslot->npages);
 
 	r = -EFAULT;
 	if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
-- 
1.6.1.2

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