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Date:   Tue, 29 Dec 2020 11:11:56 +0800
From:   Rongwei Wang <>
Subject: [PATCH] mm: rectify a page bad reason


When I was doing some memory-related projects, it always reported error
"nonzero mapcount", but its judgment condition was that _mapcount was not equal
to -1, so I felt the original string was a bit inappropriate, so I tried to
update it.

Signed-off-by: Rongwei Wang <>
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7a2c89b..57d7f26 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1114,7 +1114,7 @@ static const char *page_bad_reason(struct page *page, unsigned long flags)
 	const char *bad_reason = NULL;
 	if (unlikely(atomic_read(&page->_mapcount) != -1))
-		bad_reason = "nonzero mapcount";
+		bad_reason = "non-(-1) _mapcount";
 	if (unlikely(page->mapping != NULL))
 		bad_reason = "non-NULL mapping";
 	if (unlikely(page_ref_count(page) != 0))

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