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

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Message-ID: <20090212221737.GO23593@fieldses.org>
Date:	Thu, 12 Feb 2009 17:17:37 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	NeilBrown <neilb@...e.de>
Cc:	Harvey Harrison <harvey.harrison@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nfs: replace uses of __constant_{endian}

On Thu, Feb 12, 2009 at 02:15:06PM +1100, NeilBrown wrote:
> On Thu, February 12, 2009 1:52 pm, Harvey Harrison wrote:
> > 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.
> 
> Cool, thanks!

Thanks, applied.--b.
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