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Subject[PATCH] fs/io_uring.c: convert put_page() to put_user_page*()
Date
From: John Hubbard <jhubbard@nvidia.com>

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: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-block@vger.kernel.org
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
fs/io_uring.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index d542f1cf4428..8a1de5ab9c6d 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2815,7 +2815,7 @@ static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx)
struct io_mapped_ubuf *imu = &ctx->user_bufs[i];

for (j = 0; j < imu->nr_bvecs; j++)
- put_page(imu->bvec[j].bv_page);
+ put_user_page(imu->bvec[j].bv_page);

if (ctx->account_mem)
io_unaccount_mem(ctx->user, imu->nr_bvecs);
@@ -2959,10 +2959,8 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg,
* if we did partial map, or found file backed vmas,
* release any pages we did get
*/
- if (pret > 0) {
- for (j = 0; j < pret; j++)
- put_page(pages[j]);
- }
+ if (pret > 0)
+ put_user_pages(pages, pret);
if (ctx->account_mem)
io_unaccount_mem(ctx->user, nr_pages);
kvfree(imu->bvec);
--
2.22.0
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