1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 7fb31da45d03..9286a46b7d69 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -93,7 +93,7 @@ static inline int kmap_atomic_idx_push(void)
 
 #ifdef CONFIG_DEBUG_HIGHMEM
         WARN_ON_ONCE(in_irq() && !irqs_disabled());
-        BUG_ON(idx > KM_TYPE_NR);
+        BUG_ON(idx >= KM_TYPE_NR);
 #endif
         return idx;
 }