linux-kernel - Re: [PATCH] w1: Introduce a slave mutex for serializing IO.

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Message-ID: <20120503212706.GA26612@ioremap.net>
Date:	Fri, 4 May 2012 01:27:06 +0400
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	NeilBrown <neilb@...e.de>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] w1: Introduce a slave mutex for serializing IO.

On Fri, May 04, 2012 at 07:08:38AM +1000, NeilBrown (neilb@...e.de) wrote:
> You can only check the owner on SMP builds, or when debugging is enabled.
> So I don't think that approach can work.

You can store owner in master device and protect with mutex itself.
On non-smp systems it can not be preempted, so can be checked without
mutex.

-- 
	Evgeniy Polyakov
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