linux-kernel - Re: CONFIG_PREEMPT

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Message-ID: <20090812092250.GD21655@elte.hu>
Date:	Wed, 12 Aug 2009 11:22:50 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Ben Herrenschmidt <benh@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Hugh Dickins <hugh.dickins@...cali.co.uk>
Subject: Re: CONFIG_PREEMPT_RCU in next/mmotm


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> Should these tests pass...
> 
> Unless someone tells me otherwise, I will make a patch series 
> intended to replace tip/core/rcu commits 7fe616c5d ("Simplify RCU 
> CPU-hotplug notification"), 04b06256c ("Fix RCU & CPU hotplug 
> hang"), and 7256cf0e83b ("Add diagnostic check for a possible 
> CPU-hotplug race"), re-run all tests on that patchset, and submit 
> the series.  I expect the resulting patch set to have three 
> patches, one to split out boot-time initialization for RCU_TREE, a 
> second to create the cpu_notifier() API, and the third to make RCU 
> use it.

Sure - we can reasonably rebase portions of that stack of commits:

 earth4:~/tip> gll linus..core/rcu
 7256cf0: rcu: Add diagnostic check for a possible CPU-hotplug race
 04b0625: rcu: Fix RCU & CPU hotplug hang
 7fe616c: rcu: Simplify RCU CPU-hotplug notification
 240ebbf: rcu: Add synchronize_sched_expedited() rcutorture doc + updates
 0acc512: rcu: Add synchronize_sched_expedited() torture tests
 03b042b: rcu: Add synchronize_sched_expedited() primitive
 c17ef45: rcu: Remove Classic RCU

Please mention the magic words "please reset core/rcu to 240ebbf 
before applying these patches" in the mail to me, should i forget in 
the days to come.

(hm, what was i supposed to not forget? Weird.)

	Ingo
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