fork: fix pidfd_poll()'s return type
pidfd_poll() is defined as returning 'unsigned int' but the
.poll method is declared as returning '__poll_t', a bitwise type.
Fix this by using the proper return type and using the EPOLL
constants instead of the POLL ones, as required for __poll_t.
Fixes: b53b0b9d9a61 ("pidfd: add polling support")
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: stable@vger.kernel.org # 5.3
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20191120003320.31138-1-luc.vanoostenryck@gmail.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
diff --git a/kernel/fork.c b/kernel/fork.c
index 55af693..13b3879 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1708,11 +1708,11 @@
/*
* Poll support for process exit notification.
*/
-static unsigned int pidfd_poll(struct file *file, struct poll_table_struct *pts)
+static __poll_t pidfd_poll(struct file *file, struct poll_table_struct *pts)
{
struct task_struct *task;
struct pid *pid = file->private_data;
- int poll_flags = 0;
+ __poll_t poll_flags = 0;
poll_wait(file, &pid->wait_pidfd, pts);
@@ -1724,7 +1724,7 @@
* group, then poll(2) should block, similar to the wait(2) family.
*/
if (!task || (task->exit_state && thread_group_empty(task)))
- poll_flags = POLLIN | POLLRDNORM;
+ poll_flags = EPOLLIN | EPOLLRDNORM;
rcu_read_unlock();
return poll_flags;
