[PATCH 0/5] stop_machine: cleanups and fix

From	Oleg Nesterov <oleg@redhat.com>
Newsgroups	linux.kernel
Subject	[PATCH 0/5] stop_machine: cleanups and fix
Date	2015-06-30 03:40 +0200
Message-ID	<pGSGK-3PE-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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On 06/30, Oleg Nesterov wrote:
>
> But let me send some cleanups first. Plus I believe I found another
> stop_machine bug, see the last patch. So I hope these changes make
> sense in any case.

The last patch fixes the bug, I think. Say, stop_one_cpu(X) can race
with _cpu_down(X)->stop_machine() so that the kernel will crash if this
CPU X becomes online again.

The window after cpu_stopper_thread() returns and before smpboot_thread()
calls ->park() is tiny, but still this is possible afaics.

Oleg.

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[PATCH 0/5] stop_machine: cleanups and fix Oleg Nesterov <oleg@redhat.com> - 2015-06-30 03:40 +0200

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