linux-kernel - Re: [patch 2.6.18-git] SPI -- Freescale iMX SPI controller driver

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Date:	Mon, 2 Oct 2006 14:09:34 -0700
From:	David Brownell <david-b@...bell.net>
To:	Andrew Morton <akpm@...l.org>
Cc:	"Thiago Galesi" <thiagogalesi@...il.com>,
	"Andrea Paterniani" <a.paterniani@...pp-eng.it>,
	"Linux Kernel list" <linux-kernel@...r.kernel.org>
Subject: Re: [patch 2.6.18-git] SPI -- Freescale iMX SPI controller driver

On Monday 02 October 2006 1:38 pm, Andrew Morton wrote:
> On Mon, 2 Oct 2006 13:10:14 -0700
> David Brownell <david-b@...bell.net> wrote:
> 
> > > > +/* Message state */
> > > > +#define START_STATE                    ((void*)0)
> > > > +#define RUNNING_STATE                  ((void*)1)
> > > > +#define DONE_STATE                     ((void*)2)
> > > > +#define ERROR_STATE                    ((void*)-1)
> > > 
> > > !?!??!?!
> > 
> > Now that you mention it ... let me second that comment!
> 
> These are "better enums".  The problem with C's enums is that it's possible
> to mix them with integers and the compiler just swallows it.  With the
> above, you'll get a warning if you make that mistake.

I see.


>  Do the enum-mismatch checking in sparse.

With __bitwise types and values, for example...

- Dave

 
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