diff --git a/arch/x86/kvm/debugfs.c b/arch/x86/kvm/debugfs.c
index 999227fc7c66..0074a56e45b4 100644
--- a/arch/x86/kvm/debugfs.c
+++ b/arch/x86/kvm/debugfs.c
@@ -121,7 +121,7 @@ static int kvm_mmu_rmaps_stat_show(struct seq_file *m, void *v)
 				lpage_size = kvm_mmu_slot_lpages(slot, k + 1);
 				cur = log[k];
 				for (l = 0; l < lpage_size; l++) {
-					index = ffs(pte_list_count(&rmap[l]));
+					index = fls(pte_list_count(&rmap[l]));
 					if (WARN_ON_ONCE(index >= RMAP_LOG_SIZE))
 						index = RMAP_LOG_SIZE - 1;
 					cur[index]++;