linux-kernel - Re: [PATCH v5 1/7] efi: Use early_mem*() instead of early

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Date:	Wed, 18 Jun 2014 09:59:06 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Daniel Kiper <daniel.kiper@...cle.com>, linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	xen-devel@...ts.xenproject.org, andrew.cooper3@...rix.com,
	boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
	eshelton@...ox.com, hpa@...or.com, ian.campbell@...rix.com,
	jbeulich@...e.com, jeremy@...p.org, konrad.wilk@...cle.com,
	matt.fleming@...el.com, mingo@...hat.com, mjg59@...f.ucam.org,
	stefano.stabellini@...citrix.com, tglx@...utronix.de
Subject: Re: [PATCH v5 1/7] efi: Use early_mem*() instead of early_io*()

On Wed, 2014-06-18 at 13:17 +0100, Matt Fleming wrote:
> Now, the only difference between early_memremap() and early_ioremap(),
> at least on x86, is PAGE_KERNEL vs. PAGE_KERNEL_IO, where PAGE_KERNEL_IO
> has the additional _PAGE_BIT_IOMAP bit set in the pte. But that's a
> software bit for x86.

I can't comment on the x86 MMU details, but using early_memremap() will
get rid of some sparse warnings in the current code.


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