linux-kernel - Re: [PATCH] Add asm-compat.h to x86

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Message-ID: <5d6222a80710301830u7976d3eemdd1ed622d59c0a48@mail.gmail.com>
Date:	Tue, 30 Oct 2007 23:30:18 -0200
From:	"Glauber de Oliveira Costa" <glommer@...il.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"Mathieu Desnoyers" <mathieu.desnoyers@...ymtl.ca>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add asm-compat.h to x86

On 10/30/07, Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> Mathieu Desnoyers wrote:
> > Add asm-compat.h to x86
> >
> > In assembly code and in gcc inline assembly, we need .long to express a "c long"
> > type on i386 and a .quad to express the same on x86_64. Use macros similar to
> > powerpc "PPC_LONG" to express those. Name chosen: ASM_LONG. (didn't feel like
> > X86_LONG was required).
> >
> > This is useful in inline assembly within code shared between 32 and 64
> > bits architectures in x86.
> >
> > More compatible assembly macros could be added in this header later when
> > needed.
> >
> > I had to create this to implement a merged optimized immediate values
> > header for x86.
> >
>
> Seems sound to me, and this header might be a useful place to put other
> things, like macros to emit exceptions, etc...
>
I have already done similar things in the unified pvops patch. But it
was just a few locations, and I didn't fell the need for a common
thing. But it is definitely useful.

-- 
Glauber de Oliveira Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."
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