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    SubjectRe: [PATCH v3 1/1] pidfd: implement PIDFD_THREAD flag for pidfd_open()
    > @@ -2050,6 +2051,8 @@ static void pidfd_show_fdinfo(struct seq_file *m, struct file *f)
    >
    > seq_put_decimal_ll(m, "Pid:\t", nr);
    >
    > + /* TODO: report PIDFD_THREAD */

    So I think we don't need to do anything here. Since PIDFD_THREAD sets
    O_EXCL in file->f_flags and in contrast to do_dentry_open() it isn't
    dropped. So userspace can already detect PIDFD_NONBLOCK as O_NONBLOCK
    and PIDFD_THREAD as O_EXCL.

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