mm: make pagevec_lookup() update index
Make pagevec_lookup() (and underlying find_get_pages()) update index to
the next page where iteration should continue. Most callers want this
and also pagevec_lookup_tag() already does this.
Link: http://lkml.kernel.org/r/20170726114704.7626-3-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/swap.c b/mm/swap.c
index 60b1d2a..4bffd11 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -957,12 +957,13 @@ void pagevec_remove_exceptionals(struct pagevec *pvec)
* reference against the pages in @pvec.
*
* The search returns a group of mapping-contiguous pages with ascending
- * indexes. There may be holes in the indices due to not-present pages.
+ * indexes. There may be holes in the indices due to not-present pages. We
+ * also update @start to index the next page for the traversal.
*
* pagevec_lookup() returns the number of pages which were found.
*/
unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
- pgoff_t start, unsigned nr_pages)
+ pgoff_t *start, unsigned nr_pages)
{
pvec->nr = find_get_pages(mapping, start, nr_pages, pvec->pages);
return pagevec_count(pvec);