From: Peng Hao <flyingpeng@xxxxxxxxxxx>
Optimize function execution by checking whether the active_mmu_pages
list is empty.
Signed-off-by: Peng Hao <flyingpeng@xxxxxxxxxxx>
---
arch/x86/kvm/mmu/mmu.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 901be9e420a4..e8abf4387d1e 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6353,6 +6353,9 @@ static void kvm_zap_obsolete_pages(struct kvm *kvm)
int nr_zapped, batch = 0;
bool unstable;
+ if (list_empty(&kvm->arch.active_mmu_pages))
+ return;
+
restart:
list_for_each_entry_safe_reverse(sp, node,
&kvm->arch.active_mmu_pages, link) {
--
2.27.0
