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    SubjectRe: 3.14-rc2 XFS backtrace because irqs_disabled.
    On 02/14, Al Viro wrote:
    >
    > BTW, Oleg, could you explain why does PTRACE_PEEK_SIGINFO copy ->si_code
    > separately? IOW, why do we want the upper 16 bits of ->si_code exposed?
    > It used to be a strictly internal thing IIRC (it's been what, 2.3.late?)

    Yes, but checkpoint/restart tools want to dump/restore the internal part
    of ->si_code too.

    See also the "task_pid_vnr(current) == pid" hack in do_rt_sigqueueinfo(),
    this allows to queue a SI_FROMKERNEL() siginfo.

    Oleg.



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