mm/vmscan: remove unneeded return value of kswapd_run()

The return value of kswapd_run() is unused now.  Clean it up.

Link: https://lkml.kernel.org/r/20210717065911.61497-4-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Alex Shi <alexs@kernel.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Shaohua Li <shli@fb.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/swap.h b/include/linux/swap.h
index f30d26b..ba52f3a 100644 (file)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -408,7 +408,7 @@ static inline bool node_reclaim_enabled(void)
 
 extern void check_move_unevictable_pages(struct pagevec *pvec);
 
-extern int kswapd_run(int nid);
+extern void kswapd_run(int nid);
 extern void kswapd_stop(int nid);
 
 #ifdef CONFIG_SWAP

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8857e4d..ab50197 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4434,23 +4434,20 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
  * This kswapd start function will be called by init and node-hot-add.
  * On node-hot-add, kswapd will moved to proper cpus if cpus are hot-added.
  */
-int kswapd_run(int nid)
+void kswapd_run(int nid)
 {
        pg_data_t *pgdat = NODE_DATA(nid);
-       int ret = 0;
 
        if (pgdat->kswapd)
-               return 0;
+               return;
 
        pgdat->kswapd = kthread_run(kswapd, pgdat, "kswapd%d", nid);
        if (IS_ERR(pgdat->kswapd)) {
                /* failure at boot is fatal */
                BUG_ON(system_state < SYSTEM_RUNNING);
                pr_err("Failed to start kswapd on node %d\n", nid);
-               ret = PTR_ERR(pgdat->kswapd);
                pgdat->kswapd = NULL;
        }
-       return ret;
 }
 
 /*