linux-kernel - Re: [PATCH 02/11] efi: Remove EFI_PAGE_SHIFT and EFI_PAGE

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Date:	Sat, 21 Sep 2013 17:59:15 +0200
From:	Leif Lindholm <leif.lindholm@...aro.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Matt Fleming <matt@...sole-pimps.org>,
	Mark Salter <msalter@...hat.com>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...e.de>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Dave Young <dyoung@...hat.com>, linux-efi@...r.kernel.org,
	Roy Franz <roy.franz@...aro.org>
Subject: Re: [PATCH 02/11] efi: Remove EFI_PAGE_SHIFT and EFI_PAGE_SIZE

On Sat, Sep 21, 2013 at 05:41:43PM +0200, Borislav Petkov wrote:
> On Sat, Sep 21, 2013 at 05:21:39PM +0200, Leif Lindholm wrote:
> 
> > It will probably not be a problem on the stub side, and it's not used
> > in many places but it would break efi_lookup_mapped_address(),
> > efi_range_is_wc() and memrange_efi_to_native() for use by arm64.
> > At least the first of these would be a problem.
> 
> Ok, maybe the generic header include/linux/efi.h might be a problem but
> the rest are changes to arch/x86/ which should have no effect whatsoever
> on any other arch.

Indeed - my concerns are restricted to include/linux/efi.h and
drivers/firmware/efi.c.

> Or are you planning to move some of it into generic code?

I think some of the stub code is moved to generic in Roy's/Mark's
patches - but then the stub shouldn't be an issue as in UEFI we have
4K pages.

/
    Leif
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