linux-kernel - Re: [PATCH] Fix left over EFI cache mapping problems

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Date:	Fri, 15 Feb 2008 08:30:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Huang, Ying" <ying.huang@...el.com>,
	Andi Kleen <andi@...stfloor.org>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix left over EFI cache mapping problems


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> So *if* we care (I doubt we do, since EFI_PAGE_SHIFT at least right 
> now matches PAGE_SHIFT on x86), you'd probably want to do something 
> like
> 
>   static inline unsigned long efi_pages_to_native_pages(unsigned long efi_pages)
>   {
>   #if EFI_PAGE_SHIFT > PAGE_SHIFT
> 	return efi_pages << (EFI_PAGE_SHIFT - PAGE_SHIFT);
>   #else
> 	return efi_pages >> (PAGE_SHIFT - EFI_PAGE_SHIFT);
>   #endif
>   }

yeah, this is even cleaner - i guess EFI_PAGE_SHIFT will be around in 
the future too because it's also used on ia64.

	Ingo
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