memcg: remove some redundant checks

We don't need to check do_swap_account in the case that the function which
checks do_swap_account will never get called if do_swap_account == 0.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 8 deletions

diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 672089d5819f..f22b4ebbd8dc 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -311,8 +311,6 @@ static int swap_cgroup_prepare(int type)
         struct swap_cgroup_ctrl *ctrl;
         unsigned long idx, max;
 
-        if (!do_swap_account)
-                return 0;
         ctrl = &swap_cgroup_ctrl[type];
 
         for (idx = 0; idx < ctrl->length; idx++) {
@@ -349,9 +347,6 @@ unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
         struct swap_cgroup *sc;
         unsigned short old;
 
-        if (!do_swap_account)
-                return 0;
-
         ctrl = &swap_cgroup_ctrl[type];
 
         mappage = ctrl->map[idx];
@@ -380,9 +375,6 @@ unsigned short lookup_swap_cgroup(swp_entry_t ent)
         struct swap_cgroup *sc;
         unsigned short ret;
 
-        if (!do_swap_account)
-                return 0;
-
         ctrl = &swap_cgroup_ctrl[type];
         mappage = ctrl->map[idx];
         sc = page_address(mappage);