linux-kernel - Re: [PATCH] x86 byteorder.h: use __asm__/__inline_

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Message-ID: <49567EB5.5030409@zytor.com>
Date:	Sat, 27 Dec 2008 11:15:01 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	Ingo Molnar <mingo@...e.hu>, Mike Frysinger <vapier@...too.org>,
	tglx@...utronix.de, mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86 byteorder.h: use __asm__/__inline__ for userspace

Sam Ravnborg wrote:
> On Sat, Dec 27, 2008 at 10:58:11AM -0800, H. Peter Anvin wrote:
>> Sam Ravnborg wrote:
>>> I wnet with the scripted conversion for now.
>>> If that does not fly we can come back to this proposal.
>>>
>>> What I like most with the auto conversion is that we avoid
>>> adding yet another special rule about how to do stuff in exported headers.
>>>
>> Indeed, and being keyword conversion, it's independent of context, at
>> least as long as one doesn't have too many run-ins with weird uses of
>> the # and ## preprocessor operators, which are a *lot* easier to rule
>> out globally.
> 
> Speaking of what we want to use in exported headers.
> What is the recommendation with respect to uint32_t and friends?
> To my best knowledge they are banned in exported headers as they
> are not part of the kernel namespace and I see few users too.
> But is this something we should check for?

I personally would not be upset if we auto-changed {su}{8,16,32,64},
[u]int_{8,16,32,64}_t and bool into the appropriate __{su}{8,16,32,64}
types and _Bool.  I think the upside is way bigger than the potential
downside.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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