linux-kernel - Re: [PATCH] sparc64: Annotate pointers in PeeCeeI.c

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Message-Id: <1224117171.5815.17.camel@brick>
Date:	Wed, 15 Oct 2008 17:32:51 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] sparc64: Annotate pointers in PeeCeeI.c

On Wed, 2008-10-15 at 17:23 -0700, David Miller wrote:
> From: Harvey Harrison <harvey.harrison@...il.com>
> Date: Wed, 15 Oct 2008 17:15:19 -0700
> 
> > This has no functional changes, but annotates the code to make
> > the endianness more clear.  In addition, removes some of the only
> > users of cpu_to_le[16|32]p in the kernel.
> > 
> > Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
> 
> Remind me what the problem is with cpu_to_{le,be}*()?
> 

Nothing inherently wrong with them, other than it seems that nearly
every user (not this one) would be better served using the by-value
versions.

> The interface names define a direction, which in this case is
> "CPU endianness to BE/LE endianness".  And that is exactly
> what is happening in the out*() routines.
> 
> This aids comprehension of the code and is quite useful IMHO.

Yes, and even from that angle I think my patch is more instructive to
understanding the direction, compare for example in the same file
outsw versus outsl which this patch changes.

Harvey



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