From: Miaohe Lin <linmiaohe@huawei.com>
Date: Wed, 16 Mar 2022 08:15:28 +0000 (+0800)
Subject: mm/damon: minor cleanup for damon_pa_young
X-Git-Tag: v5.18-rc1~167^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2a3c4bce3edb0d54983384aa8a88c0da330638f4;p=thirdparty%2Fkernel%2Flinux.git

mm/damon: minor cleanup for damon_pa_young

if need_lock is true but folio_trylock fails, we should return false
instead of NULL to match the return value type exactly. No functional
change intended.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index ae24549921e2f..74c2b6e1ca489 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -152,7 +152,7 @@ static bool damon_pa_young(unsigned long paddr, unsigned long *page_sz)
 	need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
 	if (need_lock && !folio_trylock(folio)) {
 		folio_put(folio);
-		return NULL;
+		return false;
 	}
 
 	rmap_walk(folio, &rwc);