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

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Message-Id: <1233170532.6717.49.camel@brick>
Date:	Wed, 28 Jan 2009 11:22:12 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	"H. Peter Anvin" <hpa@...nel.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	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]

On Wed, 2009-01-28 at 09:48 -0800, H. Peter Anvin wrote:
> 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.
> 

But now that swab.h has been separated out, we could just stop exporting the
asm/swab.h bits while still providing a generic C-based implementation to
userspace.

Harvey


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