linux-kernel - Re: [PATCH 2/33] i386: define __pa

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Date:	Wed, 2 Aug 2006 05:04:17 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-kernel@...r.kernel.org, Horms <horms@...ge.net.au>,
	Jan Kratochvil <lace@...kratochvil.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Magnus Damm <magnus.damm@...il.com>,
	Vivek Goyal <vgoyal@...ibm.com>, Linda Wang <lwang@...hat.com>
Subject: Re: [PATCH 2/33] i386: define __pa_symbol


> Yes.  ISO C only defines pointer arithmetic with in arrays.  
> I believe gnu C makes it a well defined case.

Nope, it doesn't.

There was a miscompilation on PPC some time ago, that is why
HIDE_RELOC() and __pa_symbol() was implemented.

> 
> Currently we do not appear to have any problems on i386.
> But I have at least one case of code that is shared between
> i386 and x86_64 and it is appropriate to use __pa_symbol on
> x86_64.
> 
> So I added __pa_symbol for that practical reason.
> 
> I would have no problems with generalizing this but I wanted to
> at least make it possible to use the concept on i386.

No problem with that, just use HIDE_RELOC

-Andi
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