Subject: [PATCH 20/34] xen: convert put_page() to put_user_page*()

From: [email-masked]
Date: Thu, 1 Aug 2019 19:19:51 -0700

From: John Hubbard <[email-masked]>

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().

This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").

Cc: Boris Ostrovsky <[email-masked]>
Cc: Juergen Gross <[email-masked]>
Cc: [email-masked]
Signed-off-by: John Hubbard <[email-masked]>
---
 drivers/xen/gntdev.c  | 5 +----
 drivers/xen/privcmd.c | 7 +------
 2 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 4c339c7e66e5..2586b3df2bb6 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -864,10 +864,7 @@ static int gntdev_get_page(struct gntdev_copy_batch *batch, void __user *virt,
 
 static void gntdev_put_pages(struct gntdev_copy_batch *batch)
 {
-	unsigned int i;
-
-	for (i = 0; i < batch->nr_pages; i++)
-		put_page(batch->pages[i]);
+	put_user_pages(batch->pages, batch->nr_pages);
 	batch->nr_pages = 0;
 }
 
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 2f5ce7230a43..29e461dbee2d 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -611,15 +611,10 @@ static int lock_pages(
 
 static void unlock_pages(struct page *pages[], unsigned int nr_pages)
 {
-	unsigned int i;
-
 	if (!pages)
 		return;
 
-	for (i = 0; i < nr_pages; i++) {
-		if (pages[i])
-			put_page(pages[i]);
-	}
+	put_user_pages(pages, nr_pages);
 }
 
 static long privcmd_ioctl_dm_op(struct file *file, void __user *udata)
-- 
2.22.0

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