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Message-Id: <20140515162412.51355f308c34768ad08c0e2f@linux-foundation.org> Date: Thu, 15 May 2014 16:24:12 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: riel@...hat.com Cc: linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com, rdunlap@...radead.org, richard@....at, umgwanakikbuti@...il.com Subject: Re: [PATCH 2/2] sysrq,rcu: suppress RCU stall warnings while sysrq runs On Tue, 29 Apr 2014 14:06:36 -0400 riel@...hat.com wrote: > From: Rik van Riel <riel@...hat.com> > > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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