[PATCH 3/4] mm, swap: return early from swap_extend_table_try_free() on first non-zero entry

[Kemeng Shi]

Return immediately when the first non-zero swap count is found as
any non-zero swap count prevents freeing extend_table and further
iteration is pointless.

Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
---
 mm/swapfile.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 81c4040912be..3fcbd10c6353 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1530,20 +1530,17 @@ int swap_retry_table_alloc(swp_entry_t entry, gfp_t gfp)
 static void swap_extend_table_try_free(struct swap_cluster_info *ci)
 {
 	unsigned long i;
-	bool can_free = true;
 
 	if (!ci->extend_table)
 		return;
 
 	for (i = 0; i < SWAPFILE_CLUSTER; i++) {
 		if (ci->extend_table[i])
-			can_free = false;
+			return;
 	}
 
-	if (can_free) {
-		kfree(ci->extend_table);
-		ci->extend_table = NULL;
-	}
+	kfree(ci->extend_table);
+	ci->extend_table = NULL;
 }
 
 /* Decrease the swap count of one slot, without freeing it */
-- 
2.36.1