linux-kernel - Re: [PATCH v2 6/6] stop_machine: kill stop_cpus_lock and lg_double

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Message-ID: <20150731111246.GS18673@twins.programming.kicks-ass.net>
Date:	Fri, 31 Jul 2015 13:12:46 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/6] stop_machine: kill stop_cpus_lock and
 lg_double_lock/unlock()

On Thu, Jul 30, 2015 at 11:55:27PM +0200, Peter Zijlstra wrote:
> 
> Exclusion between stop_{one,two}_cpu{,s}() and stop_cpus() makes this
> trivially go away.
> 
> Paul's RCU branch already kills try_stop_cpus() dead, so that wart is
> also gone. But we're still stuck with stop_machine_from_inactive_cpu()
> which does a spin-wait for exclusive state. So I suppose we'll have to
> keep stop_cpus_mutex :/

*groan* we really need to kill that from_inactive_cpu() shite too. Lemme
go have a look at how this MTRR crap works.
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