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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon, 29 May 2017 09:40:16 -0700
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Subject: Re: [PATCH] kthread: fix boot hang (regression) on MIPS/OpenRISC
To: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
        Ralf Baechle <ralf@linux-mips.org>, Stafford Horne <shorne@gmail.com>,
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        Jamie Iles <jamie.iles@oracle.com>
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On Mon, May 29, 2017 at 12:22 AM, Vegard Nossum
<vegard.nossum@oracle.com> wrote:
> This fixes a regression in commit 4d6501dce079 where I didn't notice
> that MIPS and OpenRISC were reinitialising p->{set,clear}_child_tid to
> NULL after our initialisation in copy_process().

Ok, I'll just take this directly, since it's such an odd set of architectures.

I guess it could come in through the next "misc fixes" pull request
from the -tip tree (which is where the change that broke this came
from), but ..

             Linus