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KVM: MMU: make __kvm_mmu_free_some_pages handle empty list 

First check if the list is empty before attempting to look at list
entries.

Cc: stable@kernel.org
Signed-off-by: Izik Eidus <ieidus@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Izik Eidus 2009-07-28 15:26:58 -03:00 committed by Avi Kivity
parent 95fb4eb698
commit 3b80fffe2b
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/mmu.c
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@ -2705,7 +2705,8 @@ EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page_virt);
void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
{
while (vcpu->kvm->arch.n_free_mmu_pages < KVM_REFILL_PAGES) {
while (vcpu->kvm->arch.n_free_mmu_pages < KVM_REFILL_PAGES &&
!list_empty(&vcpu->kvm->arch.active_mmu_pages)) {
struct kvm_mmu_page *sp;
sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev,