mm/page-writeback: check-before-clear PageReclaim
With the page flag sanitization patchset, an invalid usage of
ClearPageReclaim() is detected in set_page_dirty(). This can be called
from __unmap_hugepage_range(), so let's check PageReclaim() before trying
to clear it to avoid the misuse.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0372411..5daf556 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2228,7 +2228,8 @@
* it will confuse readahead and make it restart the size rampup
* process. But it's a trivial problem.
*/
- ClearPageReclaim(page);
+ if (PageReclaim(page))
+ ClearPageReclaim(page);
#ifdef CONFIG_BLOCK
if (!spd)
spd = __set_page_dirty_buffers;