On Fri, Nov 20, 2020 at 05:14:28PM -0600, Eric W. Biederman wrote:
>
> diff --git a/fs/file.c b/fs/file.c
> index 5861c4f89419..6448523ca29e 100644
> --- a/fs/file.c
> +++ b/fs/file.c
> @@ -865,6 +865,21 @@ struct file *fget_task(struct task_struct *task, unsigned int fd)
> return file;
> }
>
> +struct file *task_lookup_fd_rcu(struct task_struct *task, unsigned int fd)
> +{
> + /* Must be called with rcu_read_lock held */
Eric, maybe worth to have something like
RCU_LOCKDEP_WARN(!rcu_read_lock_held(),
"suspicious task_lookup_fd_rcu() usage");
here?
