linux-kernel - Re: [PATCH 0 of 4] x86: some more patches

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Date:	Wed, 16 Jan 2008 15:44:15 +0100
From:	Andi Kleen <ak@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Glauber de Oliveira Costa <glommer@...il.com>,
	Jan Beulich <jbeulich@...ell.com>
Subject: Re: [PATCH 0 of 4] x86: some more patches


> Index: linux-x86.q/include/asm-x86/page.h
> ===================================================================
> --- linux-x86.q.orig/include/asm-x86/page.h
> +++ linux-x86.q/include/asm-x86/page.h
> @@ -11,7 +11,7 @@
>  #ifdef __KERNEL__
>  
>  #define PHYSICAL_PAGE_MASK	(PAGE_MASK & __PHYSICAL_MASK)


I haven't tested yet, but we looked at that one earlier and I thought
it was ok because 

#define __PHYSICAL_MASK          _AT(phys_addr_t, (_AC(1,ULL) << __PHYSICAL_MASK_SHIFT) - 1)

and 

typedef u64     phys_addr_t;

for PAE. So the expression above should have been already 64bit.



> -#define PTE_MASK		PHYSICAL_PAGE_MASK
> +#define PTE_MASK		(_AT(long, PHYSICAL_PAGE_MASK))

That would mean it is 32bit again because 32bit long is 32bit, but on 32bit 
PAE PTE_MASK definitely needs to be 64bit.

So I would be surprised if the patch works.

The problem seems to be rather that PAGE_MASK does not include the bits above 32bit. 
Something like

#define PHYSICAL_PAGE_MASK (__PHYSICAL_MASK & ~(phys_addr_t)(PAGE_SIZE-1))

should work (untested) 

-Andi
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