Merge tag 'mm-nonmm-stable-2023-04-27-16-01' of git://git.kernel.org/pub/scm/linux...

[platform/kernel/linux-starfive.git] / fs / eventpoll.c

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 98134f0..9804834 100644 (file)
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -488,8 +488,8 @@ static inline void ep_set_busy_poll_napi_id(struct epitem *epi)
  * (efd1) notices that it may have some event ready, so it needs to wake up
  * the waiters on its poll wait list (efd2). So it calls ep_poll_safewake()
  * that ends up in another wake_up(), after having checked about the
- * recursion constraints. That are, no more than EP_MAX_POLLWAKE_NESTS, to
- * avoid stack blasting.
+ * recursion constraints. That are, no more than EP_MAX_NESTS, to avoid
+ * stack blasting.
  *
  * When CONFIG_DEBUG_LOCK_ALLOC is enabled, make sure lockdep can handle
  * this special case of epoll.
@@ -2087,6 +2087,19 @@ SYSCALL_DEFINE1(epoll_create, int, size)
        return do_epoll_create(0);
 }
 
+#ifdef CONFIG_PM_SLEEP
+static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
+{
+       if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
+               epev->events &= ~EPOLLWAKEUP;
+}
+#else
+static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
+{
+       epev->events &= ~EPOLLWAKEUP;
+}
+#endif
+
 static inline int epoll_mutex_lock(struct mutex *mutex, int depth,
                                   bool nonblock)
 {