linux-kernel - Re: [PATCH] afs: fsclient.c sparse endian annotations of operation

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Message-ID: <28254.1219835544@redhat.com>
Date:	Wed, 27 Aug 2008 12:12:24 +0100
From:	David Howells <dhowells@...hat.com>
To:	Harvey Harrison <harvey.harrison@...il.com>
Cc:	dhowells@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] afs: fsclient.c sparse endian annotations of operation_ID

Harvey Harrison <harvey.harrison@...il.com> wrote:

> +		if (call->operation_ID != __constant_htonl(FSFETCHDATA64)) {

Doesn't htonl() resolve to this for a constant argument?  Following through
the definitions, it certainly looks like it ought to:

	<linux/byteorder/generic.h>
	#undef htonl
	#define ___htonl(x) __cpu_to_be32(x)

	<linux/byteorder/little_endian.h>
	#define __cpu_to_be32(x) ((__force __be32)__swab32((x)))

	<linux/byteorder/swab.h>
	#  define __swab32(x) \
	(__builtin_constant_p((__u32)(x)) ? \
	 ___constant_swab32((x)) : \
	 __fswab32((x)))

at least for GCC with optimisation enabled.

Of course, linux/byteorder.h and linux/swab.h seem to do much the same.  Any
idea why we have both sets?  There seems to be unnecessary redundancy.

David
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