linux-kernel - Re: [PATCH] nfs: replace uses of __constant

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Date:	Wed, 11 Feb 2009 18:52:31 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	NeilBrown <neilb@...e.de>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nfs: replace uses of __constant_{endian}

On Thu, 2009-02-12 at 13:50 +1100, NeilBrown wrote:
> On Thu, February 12, 2009 12:16 pm, Harvey Harrison wrote:
> > The base versions handle constant folding now, none of these headers
> > are exported to userspace, so the __ prefixed versions are not
> > necessary.
> 
> I assume you compile tested this?
> 
> I seem to recall that the reason we did it that way was that
> some of the error codes are used in switch statements, and
> the value for a 'case:' really has to look like a constant, not just
> happen to evaluate to one.

Yes, this requirement was explicitly built-in.  See how the various
__swabXX bits are done in linux/swab.h.

Harvey

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