[PATCH v1 05/11] watch_queue: zero page->private when freeing pages

[Zi Yan]

This prepares for upcoming checks in page freeing path.

Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Eric Sandeen <sandeen@xxxxxxxxxx>
---
 kernel/watch_queue.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/watch_queue.c b/kernel/watch_queue.c
index 52f89f1137da..8f887eafd438 100644
--- a/kernel/watch_queue.c
+++ b/kernel/watch_queue.c
@@ -301,8 +301,10 @@ long watch_queue_set_size(struct pipe_inode_info *pipe, unsigned int nr_notes)
 	return 0;
 
 error_p:
-	while (--i >= 0)
+	while (--i >= 0) {
+		set_page_private(pages[i], 0);
 		__free_page(pages[i]);
+	}
 	kfree(pages);
 error:
 	(void) account_pipe_buffers(pipe->user, nr_pages, pipe->nr_accounted);
@@ -398,8 +400,10 @@ static void __put_watch_queue(struct kref *kref)
 	struct watch_filter *wfilter;
 	int i;
 
-	for (i = 0; i < wqueue->nr_pages; i++)
+	for (i = 0; i < wqueue->nr_pages; i++) {
+		set_page_private(wqueue->notes[i], 0);
 		__free_page(wqueue->notes[i]);
+	}
 	kfree(wqueue->notes);
 	bitmap_free(wqueue->notes_bitmap);
 
-- 
2.51.0