linux-kernel - Re: [RFC] mmiotrace full patch, preview 1

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Message-ID: <20080225233449.GA25448@infradead.org>
Date:	Mon, 25 Feb 2008 18:34:49 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Pekka Paalanen <pq@....fi>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Christoph Hellwig <hch@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Pavel Roskin <proski@....org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andy Whitcroft <apw@...dowen.org>
Subject: Re: [RFC] mmiotrace full patch, preview 1

On Mon, Feb 25, 2008 at 02:49:22PM -0800, Andrew Morton wrote:
> the things which it finds.
> 
> > +static DECLARE_MUTEX(kmmio_init_mutex);
> 
> That's not a mutex.
> 
> > +	down(&kmmio_init_mutex);
> 
> It's a semaphore.  Please do convert it to a mutex.
> 
> Andy, I'd say that addition of new semaphores is worth a warning - they're
> rarely legitimate.

I'm not sure that any semaphore should be a warning, but the initializer
for semaphore used as binary mutex (DECLARE_MUTEX and init_MUTEX) are
worth it.

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