diff mbox series

[028/156] mm/page-writeback: support tail pages in wait_for_stable_page

Message ID 20201016024233.afi-U5P5P%akpm@linux-foundation.org
State New
Headers show
Series [001/156] device-dax/kmem: fix resource release | expand

Commit Message

Andrew Morton Oct. 16, 2020, 2:42 a.m. UTC
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: mm/page-writeback: support tail pages in wait_for_stable_page

page->mapping is undefined for tail pages, so operate exclusively on the
head page.

Link: https://lkml.kernel.org/r/20200908195539.25896-11-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: SeongJae Park <sjpark@amazon.de>
Cc: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page-writeback.c |    1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

--- a/mm/page-writeback.c~mm-page-writeback-support-tail-pages-in-wait_for_stable_page
+++ a/mm/page-writeback.c
@@ -2849,6 +2849,7 @@  EXPORT_SYMBOL_GPL(wait_on_page_writeback
  */
 void wait_for_stable_page(struct page *page)
 {
+	page = thp_head(page);
 	if (page->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES)
 		wait_on_page_writeback(page);
 }