linux-kernel - [patch 0/2] stop_machine: create kstop threads only when needed

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Message-Id: <20081222113629.080104676@de.ibm.com>
Date:	Mon, 22 Dec 2008 12:36:29 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: [patch 0/2] stop_machine: create kstop threads only when needed

Introduce stop_machine_create/destroy. With this interface subsystems
that need a non-failing stop_machine environment can create the
stop_machine threads before actually calling stop_machine.
When the threads aren't needed anymore they can be killed with
stop_machine_destroy again.

When stop_machine gets called and the threads aren't present they
will be created and destroyed automatically.

This restores the old behaviour of stop_machine from 2.6.27 and thus
we get rid of the normally not needed kstop threads.

The second patch converts the module loader/unloder code to the new
interface, since it needs a non-failing stop_machine infrastructure.

Looks like there are more users that need a non-failing version.
I'll take care of them when I'm back from vacation.
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