linux-kernel - [PATCH v2 4/5] mm/memory-failure: move hwpoison

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Date: Fri, 10 May 2024 00:26:01 -0600
From: Jane Chu <jane.chu@...cle.com>
To: linmiaohe@...wei.com, nao.horiguchi@...il.com, akpm@...ux-foundation.org,
        osalvador@...e.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/5] mm/memory-failure: move hwpoison_filter() higher up

Move hwpoison_filter() higher up as there is no need to spend a lot
cycles only to find out later that the page is supposed to be skipped
for hwpoison handling.

Signed-off-by: Jane Chu <jane.chu@...cle.com>
---
 mm/memory-failure.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 62133c10fb51..2fa884d8b5a3 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2236,6 +2236,13 @@ int memory_failure(unsigned long pfn, int flags)
 		goto unlock_mutex;
 	}
 
+	if (hwpoison_filter(p)) {
+		if (flags & MF_COUNT_INCREASED)
+			put_page(p);
+		res = -EOPNOTSUPP;
+		goto unlock_mutex;
+	}
+
 try_again:
 	res = try_memory_failure_hugetlb(pfn, flags, &hugetlb);
 	if (hugetlb)
@@ -2354,14 +2361,6 @@ int memory_failure(unsigned long pfn, int flags)
 	 */
 	page_flags = folio->flags;
 
-	if (hwpoison_filter(p)) {
-		ClearPageHWPoison(p);
-		folio_unlock(folio);
-		folio_put(folio);
-		res = -EOPNOTSUPP;
-		goto unlock_mutex;
-	}
-
 	/*
 	 * __munlock_folio() may clear a writeback folio's LRU flag without
 	 * the folio lock. We need to wait for writeback completion for this
-- 
2.39.3