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

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Date:	Tue, 26 Feb 2008 10:21:49 +0000
From:	Andy Whitcroft <apw@...dowen.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Paalanen <pq@....fi>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Pavel Roskin <proski@....org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC] mmiotrace full patch, preview 1

On Mon, Feb 25, 2008 at 06:34:49PM -0500, Christoph Hellwig wrote:
> 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.

Ok, so that would be the following, work for everyone?

WARNING: mutexes are preferred for single holder semaphores
#1: FILE: Z95.c:1:
+       DECLARE_MUTEX(&foo);

WARNING: mutexes are preferred for single holder semaphores
#3: FILE: Z95.c:3:
+       init_MUTEX(&foo);

-apw
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