Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Yang Shi <shy828301@gmail.com>
To:     naoya.horiguchi@nec.com, hughd@google.com,
        kirill.shutemov@linux.intel.com, willy@infradead.org,
        peterx@redhat.com, osalvador@suse.de, akpm@linux-foundation.org
Cc:     shy828301@gmail.com, linux-mm@kvack.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [v4 PATCH 6/6] mm: hwpoison: handle non-anonymous THP correctly
Date:   Thu, 14 Oct 2021 12:16:15 -0700
Message-Id: <20211014191615.6674-7-shy828301@gmail.com>
In-Reply-To: <20211014191615.6674-1-shy828301@gmail.com>
References: <20211014191615.6674-1-shy828301@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Currently hwpoison doesn't handle non-anonymous THP, but since v4.8 THP
support for tmpfs and read-only file cache has been added.  They could
be offlined by split THP, just like anonymous THP.

Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Yang Shi <shy828301@gmail.com>
---
 mm/memory-failure.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index f5eab593b2a7..3db738c02ab2 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1443,14 +1443,11 @@ static int identify_page_state(unsigned long pfn, struct page *p,
 static int try_to_split_thp_page(struct page *page, const char *msg)
 {
 	lock_page(page);
-	if (!PageAnon(page) || unlikely(split_huge_page(page))) {
+	if (unlikely(split_huge_page(page))) {
 		unsigned long pfn = page_to_pfn(page);
 
 		unlock_page(page);
-		if (!PageAnon(page))
-			pr_info("%s: %#lx: non anonymous thp\n", msg, pfn);
-		else
-			pr_info("%s: %#lx: thp split failed\n", msg, pfn);
+		pr_info("%s: %#lx: thp split failed\n", msg, pfn);
 		put_page(page);
 		return -EBUSY;
 	}
-- 
2.26.2