linux-kernel - [PATCH v2] mm: memory-failure: cleanup try_to_split_thp

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Message-ID: <20220809111813.139690-1-wangkefeng.wang@huawei.com>
Date:   Tue, 9 Aug 2022 19:18:13 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Naoya Horiguchi <naoya.horiguchi@....com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>
CC:     <linux-kernel@...r.kernel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v2] mm: memory-failure: cleanup try_to_split_thp_page()

Since commit 5d1fd5dc877b ("mm,hwpoison: introduce MF_MSG_UNSPLIT_THP"),
the action_result(,MF_MSG_UNSPLIT_THP,) called to show memory error event
in memory_failure(), so the pr_info() in try_to_split_thp_page() is only
needed in soft_offline_in_use_page().

Meanwhile this could also fix the unexpected prefix for "thp split failed"
due to commit 96f96763de26 ("mm: memory-failure: convert to pr_fmt()").

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
v2: update changelog

 mm/memory-failure.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 14439806b5ef..0dfed9d7b273 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1524,20 +1524,18 @@ static int identify_page_state(unsigned long pfn, struct page *p,
 	return page_action(ps, p, pfn);
 }
 
-static int try_to_split_thp_page(struct page *page, const char *msg)
+static int try_to_split_thp_page(struct page *page)
 {
+	int ret;
+
 	lock_page(page);
-	if (unlikely(split_huge_page(page))) {
-		unsigned long pfn = page_to_pfn(page);
+	ret = split_huge_page(page);
+	unlock_page(page);
 
-		unlock_page(page);
-		pr_info("%s: %#lx: thp split failed\n", msg, pfn);
+	if (unlikely(ret))
 		put_page(page);
-		return -EBUSY;
-	}
-	unlock_page(page);
 
-	return 0;
+	return ret;
 }
 
 static void unmap_and_kill(struct list_head *to_kill, unsigned long pfn,
@@ -2079,7 +2077,7 @@ int memory_failure(unsigned long pfn, int flags)
 		 * page is a valid handlable page.
 		 */
 		SetPageHasHWPoisoned(hpage);
-		if (try_to_split_thp_page(p, "Memory Failure") < 0) {
+		if (try_to_split_thp_page(p) < 0) {
 			action_result(pfn, MF_MSG_UNSPLIT_THP, MF_IGNORED);
 			res = -EBUSY;
 			goto unlock_mutex;
@@ -2505,8 +2503,11 @@ static int soft_offline_in_use_page(struct page *page)
 	struct page *hpage = compound_head(page);
 
 	if (!PageHuge(page) && PageTransHuge(hpage))
-		if (try_to_split_thp_page(page, "soft offline") < 0)
+		if (try_to_split_thp_page(page) < 0) {
+			pr_info("soft offline: %#lx: thp split failed\n",
+				page_to_pfn(page));
 			return -EBUSY;
+		}
 	return __soft_offline_page(page);
 }
 
-- 
2.35.3