linux-kernel - Re: [PATCH 4/12] i386: define __pa

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Date:	Wed, 04 Oct 2006 10:26:44 +0200
From:	Franck Bui-Huu <vagabon.xyz@...il.com>
To:	vgoyal@...ibm.com
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/12] i386: define __pa_symbol()

hi,

Sorry for the late feedback...

Vivek Goyal wrote:
> 
> On x86_64 we have to be careful with calculating the physical
> address of kernel symbols.  Both because of compiler odditities
> and because the symbols live in a different range of the virtual
> address space.
> 

[snip]

> +#define __pa_symbol(x)          \
> +	({unsigned long v;  \
> +	  asm("" : "=r" (v) : "0" (x)); \
> +	  __pa(v); })

Why not simply reusing RELOC_HIDE  like this ?

	#define __pa_symbol(x)	__pa(RELOC_HIDE(x,0))

thanks
		Franck
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