[PATCH 4/7] fs/userfaultfd: Use exclusive waitqueue for poll()

[Peter Xu]

Userfaultfd is the kind of fd that does not need a wake all semantics when
wake up.  Enqueue using the new POLL_ENQUEUE_EXCLUSIVE flag.

Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
 fs/userfaultfd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index f7fda7d0c994..9c39adc398fc 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -994,7 +994,7 @@ static __poll_t userfaultfd_poll(struct file *file, poll_table *wait)
 	struct userfaultfd_ctx *ctx = file->private_data;
 	__poll_t ret;
 
-	poll_wait(file, &ctx->fd_wqh, wait);
+	poll_wait_exclusive(file, &ctx->fd_wqh, wait);
 
 	if (!userfaultfd_is_initialized(ctx))
 		return EPOLLERR;
-- 
2.41.0