linux-kernel - Re: [mingo@...e.hu: [git pull] headers

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Date:	Wed, 28 Jan 2009 09:48:21 -0800
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Jaswinder Singh Rajput <jaswinderrajput@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [mingo@...e.hu: [git pull] headers_check fixes]

Arnd Bergmann wrote:
> 
> For the specific x86 swab code, that would certainly be the simplest
> way, user space should not be using those inline assemblies either
> way.
> 
> I think the more interesting question is whether we want to export
> *any* inline helpers that are not part of the ABI to user space.
> We already killed most of them (spinlocks, atomics, ...) and what
> remains is basically just the byteorder code. All that is required
> for the ABI is the information whether the system is big- or
> little-endian, but not all the rest.
> 

In general, no.  The byteswap API is a legacy exception.

	-hpa

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