[PATCH 0/5] stop_machine: cleanups and fix

[Oleg Nesterov]

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.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/