linux-kernel - Re: [RFC PATCH] kernel: add byteorder macros with alignment fixups

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Message-ID: <47E2C420.5050008@zytor.com>
Date:	Thu, 20 Mar 2008 13:08:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Harvey Harrison <harvey.harrison@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-netdev <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH] kernel: add byteorder macros with alignment fixups

Harvey Harrison wrote:
> A common pattern in the kernel (especially networking) is:
> 
> le32_to_cpu(get_unaligned((__le32 *)x));
> 
> Repeat for various combinations of le/be and 64/32/16 bit.  Add
> a variant that operates on possibly unaligned pointers to
> byteorder/generic.h
> 

This should go in <asm-generic/*> since on some architectures this can 
be done significantly faster than the chained pattern, since you can get 
the reordering for "free".  Thus, architectures should be able to 
override the generic.

	-hpa
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