linux-kernel - [PATCH v2 3/4] mm/vmscan: remove unneeded return value of kswapd

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Message-ID: <20210717065911.61497-4-linmiaohe@huawei.com>
Date:   Sat, 17 Jul 2021 14:59:10 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <hannes@...xchg.org>, <vbabka@...e.cz>, <mhocko@...e.com>,
        <axboe@...nel.dk>, <iamjoonsoo.kim@....com>, <alexs@...nel.org>,
        <apopple@...dia.com>, <willy@...radead.org>, <minchan@...nel.org>,
        <david@...hat.com>, <shli@...com>, <hillf.zj@...baba-inc.com>,
        <yuzhao@...gle.com>, <jhubbard@...dia.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v2 3/4] mm/vmscan: remove unneeded return value of kswapd_run()

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

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Acked-by: Michal Hocko <mhocko@...e.com>
---
 include/linux/swap.h | 2 +-
 mm/vmscan.c          | 7 ++-----
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 6f5a43251593..717e6e500929 100644
--- 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 a55266685eb5..260d900db20d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4286,23 +4286,20 @@ 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;
 }
 
 /*
-- 
2.23.0