Re: [PATCH 2/2] sysrq,rcu: suppress RCU stall warnings while sysrq runs

[Andrew Morton]

On Tue, 29 Apr 2014 14:06:36 -0400 riel@xxxxxxxxxx wrote:

> From: Rik van Riel <riel@xxxxxxxxxx>
> 
> Some sysrq handlers can run for a long time, because they dump a lot
> of data onto a serial console. Having RCU stall warnings pop up in
> the middle of them only makes the problem worse.
> 
> This patch temporarily disables RCU stall warnings while a sysrq
> request is handled.
>
> ...
>
>  drivers/tty/sysrq.c      |  3 +++
>  include/linux/rcupdate.h | 12 ++++++++++++
>  kernel/rcu/update.c      | 12 ++++++++++++

OK, what's going on here.  Someone (of, I suspect, a Paulish nature)
has plucked out the rcu parts of this patch, put them in linux-next and
omitted the drivers/tty part.  Very tricky!


I have done the opposite and have staged two patches against linux-next:

http://ozlabs.org/~akpm/mmots/broken-out/sysrq-rcu-ify-__handle_sysrq.patch
http://ozlabs.org/~akpm/mmots/broken-out/sysrqrcu-suppress-rcu-stall-warnings-while-sysrq-runs.patch

Please check, review, comment, etc.
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