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Message-ID: <20240527141454.113132-5-david@redhat.com>
Date: Mon, 27 May 2024 16:14:52 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
David Hildenbrand <david@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Mike Rapoport <rppt@...nel.org>,
Minchan Kim <minchan@...nel.org>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Hyeonggon Yoo <42.hyeyoo@...il.com>
Subject: [PATCH v1 4/6] mm/page_alloc: clear PageBuddy using __ClearPageBuddy() for bad pages
Let's stop using page_mapcount_reset() and clear PageBuddy using
__ClearPageBuddy() instead.
Signed-off-by: David Hildenbrand <david@...hat.com>
---
mm/page_alloc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2e22ce5675ca..b595342e73c2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -498,7 +498,8 @@ static void bad_page(struct page *page, const char *reason)
dump_stack();
out:
/* Leave bad fields for debug, except PageBuddy could make trouble */
- page_mapcount_reset(page); /* remove PageBuddy */
+ if (PageBuddy(page))
+ __ClearPageBuddy(page);
add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
}
@@ -1346,7 +1347,8 @@ static void check_new_page_bad(struct page *page)
{
if (unlikely(page->flags & __PG_HWPOISON)) {
/* Don't complain about hwpoisoned pages */
- page_mapcount_reset(page); /* remove PageBuddy */
+ if (PageBuddy(page))
+ __ClearPageBuddy(page);
return;
}
--
2.45.1
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