This is a note to let you know that I've just added the patch titled
mm: fix false-positive WARN_ON() in truncate/invalidate for hugetlb
to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-fix-false-positive-warn_on-in-truncate-invalidate-for-hugetlb.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5cbc198ae08d84bd416b672ad8bd1222acd0855c Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Date: Wed, 30 Nov 2016 15:54:19 -0800
Subject: mm: fix false-positive WARN_ON() in truncate/invalidate for hugetlb
From: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
commit 5cbc198ae08d84bd416b672ad8bd1222acd0855c upstream.
Hugetlb pages have ->index in size of the huge pages (PMD_SIZE or
PUD_SIZE), not in PAGE_SIZE as other types of pages. This means we
cannot user page_to_pgoff() to check whether we've got the right page
for the radix-tree index.
Let's introduce page_to_index() which would return radix-tree index for
given page.
We will be able to get rid of this once hugetlb will be switched to
multi-order entries.
Fixes: fc127da085c2 ("truncate: handle file thp")
Link: http://lkml.kernel.org/r/20161123093053.mjbnvn5zwxw5e6lk@xxxxxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Reported-by: Doug Nelson <doug.nelson@xxxxxxxxx>
Tested-by: Doug Nelson <doug.nelson@xxxxxxxxx>
Reviewed-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/pagemap.h | 21 +++++++++++++++------
mm/truncate.c | 8 ++++----
2 files changed, 19 insertions(+), 10 deletions(-)
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -364,16 +364,13 @@ static inline struct page *read_mapping_
}
/*
- * Get the offset in PAGE_SIZE.
- * (TODO: hugepage should have ->index in PAGE_SIZE)
+ * Get index of the page with in radix-tree
+ * (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE)
*/
-static inline pgoff_t page_to_pgoff(struct page *page)
+static inline pgoff_t page_to_index(struct page *page)
{
pgoff_t pgoff;
- if (unlikely(PageHeadHuge(page)))
- return page->index << compound_order(page);
-
if (likely(!PageTransTail(page)))
return page->index;
@@ -387,6 +384,18 @@ static inline pgoff_t page_to_pgoff(stru
}
/*
+ * Get the offset in PAGE_SIZE.
+ * (TODO: hugepage should have ->index in PAGE_SIZE)
+ */
+static inline pgoff_t page_to_pgoff(struct page *page)
+{
+ if (unlikely(PageHeadHuge(page)))
+ return page->index << compound_order(page);
+
+ return page_to_index(page);
+}
+
+/*
* Return byte-offset into filesystem object for page.
*/
static inline loff_t page_offset(struct page *page)
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -283,7 +283,7 @@ void truncate_inode_pages_range(struct a
if (!trylock_page(page))
continue;
- WARN_ON(page_to_pgoff(page) != index);
+ WARN_ON(page_to_index(page) != index);
if (PageWriteback(page)) {
unlock_page(page);
continue;
@@ -371,7 +371,7 @@ void truncate_inode_pages_range(struct a
}
lock_page(page);
- WARN_ON(page_to_pgoff(page) != index);
+ WARN_ON(page_to_index(page) != index);
wait_on_page_writeback(page);
truncate_inode_page(mapping, page);
unlock_page(page);
@@ -492,7 +492,7 @@ unsigned long invalidate_mapping_pages(s
if (!trylock_page(page))
continue;
- WARN_ON(page_to_pgoff(page) != index);
+ WARN_ON(page_to_index(page) != index);
/* Middle of THP: skip */
if (PageTransTail(page)) {
@@ -612,7 +612,7 @@ int invalidate_inode_pages2_range(struct
}
lock_page(page);
- WARN_ON(page_to_pgoff(page) != index);
+ WARN_ON(page_to_index(page) != index);
if (page->mapping != mapping) {
unlock_page(page);
continue;
Patches currently in stable-queue which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
queue-4.8/mm-thp-propagation-of-conditional-compilation-in-khugepaged.c.patch
queue-4.8/mm-fix-false-positive-warn_on-in-truncate-invalidate-for-hugetlb.patch
queue-4.8/thp-fix-corner-case-of-munlock-of-pte-mapped-thps.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html