linux-kernel - [PATCH 2/6] mm, hwpoison: use __PageMovable() to detect non-lru movable pages

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Message-ID: <20220830123604.25763-3-linmiaohe@huawei.com>
Date:   Tue, 30 Aug 2022 20:36:00 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <naoya.horiguchi@....com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH 2/6] mm, hwpoison: use __PageMovable() to detect non-lru movable pages

It's more recommended to use __PageMovable() to detect non-lru movable
pages. We can avoid bumping page refcnt via isolate_movable_page() for
the isolated lru pages. Also if pages become PageLRU just after they're
checked but before trying to isolate them, isolate_lru_page() will be
called to do the right work.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/memory-failure.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index a923a6dde871..3966fa6abe03 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2404,7 +2404,7 @@ EXPORT_SYMBOL(unpoison_memory);
 static bool isolate_page(struct page *page, struct list_head *pagelist)
 {
 	bool isolated = false;
-	bool lru = PageLRU(page);
+	bool lru = !__PageMovable(page);
 
 	if (PageHuge(page)) {
 		isolated = !isolate_hugetlb(page, pagelist);
-- 
2.23.0