[PATCH v2 4/4] mm, swap: Remove unneeded swap_extend_table_try_free() in swap_dup_entries_cluster()

[Kemeng Shi]

Since commit 0475fde0f68de ("mm, swap: avoid leaving unused extend table
after alloc race"), extend table is always allocated when any swap count
reach MAX - 1 and is always freed when swap count decrease to MAX - 1
or MAX - 2 with cluster lock held. So the extend table will always be
freed properly when decrease swap count in __swap_cluster_put_entry().
So swap_extend_table_try_free() outside of __swap_cluster_put_entry()
is unneeded and can be removed.

Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Reviewed-by: Youngjun Park <youngjun.park@xxxxxxx>
---
 mm/swapfile.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 9f43ab43b927..9f829b008de1 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1717,7 +1717,6 @@ static int swap_dup_entries_cluster(struct swap_info_struct *si,
 failed:
 	while (ci_off-- > ci_start)
 		__swap_cluster_put_entry(ci, ci_off);
-	swap_extend_table_try_free(ci);
 	swap_cluster_unlock(ci);
 	return err;
 }
-- 
2.36.1