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SubjectRe: [PATCH] pidfd: change pidfd_send_signal() to respect PIDFD_THREAD
> Is prepare_kill_siginfo() correct when we send a signal to the child
> pid namespace? si_pid = task_tgid_vnr(current) doesn't look right in
> this case but perhaps I am totally confused.
>
> And why do we need it at all? Can't sys_kill() and pidfd_send_signal()
> just use SEND_SIG_NOINFO?

Yeah, good point. I don't remember as it's been quite a while ago. My
guess is that it just tried to mirror kill() itself without being aware
of SEND_SIG_NOINFO. If you don't find anything wrong with this then
switch it to SEND_SIG_NOINFO in a preparatory patch we can backport,
please.

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