[PATCH 4/9] eventpoll: add struct wait_queue_entry argument to epoll_wait()

[Jens Axboe <axboe@kernel.dk>]

In preparation for allowing an outside caller to add itself to the epoll
waitqueue, pass in a struct wait_queue_entry. Unused in its current
form, but will be utilized shortly.

No intended functional changes in this patch.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/eventpoll.c            | 5 +++--
 include/linux/eventpoll.h | 3 ++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 3cbd290503c7..ecaa5591f4be 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -2470,7 +2470,8 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
 }
 
 int epoll_wait(struct file *file, struct epoll_event __user *events,
-	       int maxevents, struct timespec64 *to)
+	       int maxevents, struct timespec64 *to,
+	       struct wait_queue_entry *wait)
 {
 	struct eventpoll *ep;
 
@@ -2509,7 +2510,7 @@ static int do_epoll_wait(int epfd, struct epoll_event __user *events,
 	/* Get the "struct file *" for the eventpoll file */
 	CLASS(fd, f)(epfd);
 	if (!fd_empty(f))
-		return epoll_wait(fd_file(f), events, maxevents, to);
+		return epoll_wait(fd_file(f), events, maxevents, to, NULL);
 	return -EBADF;
 }
 
diff --git a/include/linux/eventpoll.h b/include/linux/eventpoll.h
index 1301fc74aca0..24f9344df5a3 100644
--- a/include/linux/eventpoll.h
+++ b/include/linux/eventpoll.h
@@ -27,7 +27,8 @@ void eventpoll_release_file(struct file *file);
 
 /* Use to reap events */
 int epoll_wait(struct file *file, struct epoll_event __user *events,
-	       int maxevents, struct timespec64 *to);
+	       int maxevents, struct timespec64 *to,
+	       struct wait_queue_entry *wait);
 
 /* Remove wait entry */
 int epoll_wait_remove(struct file *file, struct wait_queue_entry *wait);
-- 
2.47.2