As the comments of page_mapcount_is_type() indicate, the parameter
passed to the function should be one more than page->__mapcount.
However, page->__mapcount (equivalent to page->page_type) is passed to
the function by commit 4ffca5a96678 ("mm: support only one page_type per
page") where page_type_has_type() is replaced by page_mapcount_is_type(),
but the parameter isn't adjusted.
Fix the parameter passed to page_mapcount_is_type() to be (page->__mapcount
+ 1).
Fixes: 4ffca5a96678 ("mm: support only one page_type per page")
Cc: stable@xxxxxxxxxxxxxxx # v6.12+
Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
include/linux/page-flags.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 36d283552f80..ad87b4cf1f9a 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -950,7 +950,7 @@ static inline bool page_mapcount_is_type(unsigned int mapcount)
static inline bool page_has_type(const struct page *page)
{
- return page_mapcount_is_type(data_race(page->page_type));
+ return page_mapcount_is_type(data_race(page->page_type) + 1);
}
#define FOLIO_TYPE_OPS(lname, fname) \
--
2.48.1
