linux-kernel - Re: [PATCH 2/3] stop

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Message-ID: <4875582D.4040901@qualcomm.com>
Date:	Wed, 09 Jul 2008 17:30:37 -0700
From:	Max Krasnyansky <maxk@...lcomm.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	linux-kernel@...r.kernel.org, Jason Baron <jbaron@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Subject: Re: [PATCH 2/3] stop_machine: simplify

Rusty Russell wrote:
> stop_machine creates a kthread which creates kernel threads.  We can
> create those threads directly and simplify things a little.  Some care
> must be taken with CPU hotunplug, which has special needs, but that code
> seems more robust than it was in the past.
> 
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

Rusty,

You mentioned (in private conversation) that you were going to add some 
logic that checks whether CPU is running user-space code and not holding 
any locks to avoid scheduling stop_machine thread on it. Was it supposed 
to be part of this patch ?

Max
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