linux-kernel - Re: [PATCH 1/3] 24-bit types: typedef and macros for accessing 3-byte arrays as integers

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Message-ID: <20080910140712.GA12280@infradead.org>
Date:	Wed, 10 Sep 2008 10:07:12 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Chris Leech <christopher.leech@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	devel@...n-fcoe.org, jfs-discussion@...ts.sourceforge.net
Subject: Re: [PATCH 1/3] 24-bit types: typedef and macros for accessing
	3-byte arrays as integers

On Fri, Sep 05, 2008 at 09:57:32AM -0700, Chris Leech wrote:
> Both iSCSI and Fibre Channel make use of 24-bit big-endian values in
> frame headers.  This patch defines __be24 and __le24 typedefs for a
> structure wrapped around a 3-byte array, and macros to convert back and
> forth to a 32-bit integer.
> 
> The undefs in iscsi_proto.h are because of the different calling
> convention for the existing hton24 macro in the iSCSI code.  iSCSI will
> be converted in a subsequent patch.

JFS already defines an __le24, see fs/jfs/endian24.h.  Please try to
cover it, too or at least make sure you don't break it.

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