netdev - Re: [PATCH v2 1/1] drivers: net: davinci_cpdma: acknowledge interrupt properly

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Date:	Fri, 15 Feb 2013 12:18:59 -0800
From:	Joe Perches <joe@...ches.com>
To:	David Miller <davem@...emloft.net>
Cc:	mugunthanvnm@...com, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH v2 1/1] drivers: net: davinci_cpdma: acknowledge
 interrupt properly

On Fri, 2013-02-15 at 15:05 -0500, David Miller wrote:
> From: Mugunthan V N <mugunthanvnm@...com>
> Date: Thu, 14 Feb 2013 23:56:46 +0530
> 
> > +enum {
> > +     CPDMA_EOI_RX_THRESH = 0,
> > +     CPDMA_EOI_RX,
> > +     CPDMA_EOI_TX,
> > +     CPDMA_EOI_MISC,
> > +};
> 
> Do not use enumerations for hardware register values, which must be
> exact, otherwise you are potentially going to succumb to the vagaries
> of C language enumeration value assignment.

Vagaries?

In what way is c enumeration (6.7.2.2) vague?
char vs int?  Isn't smaller mostly better?

Concern about possible future reordering given an
insertion or deletion might be the only consideration
I could imagine.


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