linux-kernel - Re: [PATCH/RFC 0/4] Add stop_machine_get/put_threads to stop

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Message-Id: <200810061542.41224.rusty@rustcorp.com.au>
Date:	Mon, 6 Oct 2008 14:42:40 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	jens.axboe@...cle.com, schwidefsky@...ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC 0/4] Add stop_machine_get/put_threads to stop_machine infrastructrue.

On Friday 03 October 2008 20:56:32 you wrote:
> However we need to be able to do that without allocating any memory.

Nice work Heiko!

See free_module(), which calls stop_machine and, well, just hopes it works.  
So we've needed this for a while.

> Patch 1 is a stop_machine bugfix and is independent of the rest

Hmm, do you actually need this?  It was a whim (and clearly a dumb one).  I'm 
tempted to change it to:

	err = smdata->fn(smdata->data);
	if (err)
		smdata->fnret = err;

> Patch 2 introduces the new proposed interface

Could we just encapsulate the threads etc. into a "struct stopmachine" which 
is returned from stop_machine_prepare(), then implement everything in terms 
of that?

Thanks,
Rusty.
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