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authorYu Zhao <yuzhao@google.com>2019-03-05 15:49:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-05 21:07:20 -0800
commit5d3ee42f8f5fa5e7ccc8980878fe6e18a129b9ff (patch)
treef2450c2442939937da7fcb79282b14c0c6e96f55 /mm
parentafa00112893f4ca02777c3cf4f93011577af5ffc (diff)
downloadlinux-5d3ee42f8f5fa5e7ccc8980878fe6e18a129b9ff.tar.bz2
mm/shmem: make find_get_pages_range() work for huge page
find_get_pages_range() and find_get_pages_range_tag() already correctly increment reference count on head when seeing compound page, but they may still use page index from tail. Page index from tail is always zero, so these functions don't work on huge shmem. This hasn't been a problem because, AFAIK, nobody calls these functions on (huge) shmem. Fix them anyway just in case. Link: http://lkml.kernel.org/r/20190110030838.84446-1-yuzhao@google.com Signed-off-by: Yu Zhao <yuzhao@google.com> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Amir Goldstein <amir73il@gmail.com> Cc: Dave Chinner <david@fromorbit.com> Cc: "Darrick J . Wong" <darrick.wong@oracle.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Souptick Joarder <jrdr.linux@gmail.com> Cc: Hugh Dickins <hughd@google.com> Cc: "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>
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index ae0022f6106d..a41e01c472f3 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1789,7 +1789,7 @@ unsigned find_get_pages_range(struct address_space *mapping, pgoff_t *start,
pages[ret] = page;
if (++ret == nr_pages) {
- *start = page->index + 1;
+ *start = xas.xa_index + 1;
goto out;
}
continue;
@@ -1927,7 +1927,7 @@ unsigned find_get_pages_range_tag(struct address_space *mapping, pgoff_t *index,
pages[ret] = page;
if (++ret == nr_pages) {
- *index = page->index + 1;
+ *index = xas.xa_index + 1;
goto out;
}
continue;