[PATCHv2, RFC 10/30] thp, mm: locking tail page is a bug
From: Kirill A. Shutemov <hidden>
Date: 2013-03-14 17:50:15
Also in:
linux-fsdevel, lkml
Subsystem:
memory management, page cache, the rest · Maintainers:
Andrew Morton, Matthew Wilcox, Jan Kara, Linus Torvalds
From: "Kirill A. Shutemov" <redacted> Signed-off-by: Kirill A. Shutemov <redacted> --- mm/filemap.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/mm/filemap.c b/mm/filemap.c
index 0ff3403..38fdc92 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c@@ -669,6 +669,7 @@ void __lock_page(struct page *page) { DEFINE_WAIT_BIT(wait, &page->flags, PG_locked); + VM_BUG_ON(PageTail(page)); __wait_on_bit_lock(page_waitqueue(page), &wait, sleep_on_page, TASK_UNINTERRUPTIBLE); }
@@ -678,6 +679,7 @@ int __lock_page_killable(struct page *page) { DEFINE_WAIT_BIT(wait, &page->flags, PG_locked); + VM_BUG_ON(PageTail(page)); return __wait_on_bit_lock(page_waitqueue(page), &wait, sleep_on_page_killable, TASK_KILLABLE); }
--
1.7.10.4
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