linux-kernel - Re: [PATCH v5 02/14] efi: use early_memremap and early

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Message-ID: <1386775078.1979.98.camel@deneb.redhat.com>
Date:	Wed, 11 Dec 2013 10:17:58 -0500
From:	Mark Salter <msalter@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Leif Lindholm <leif.lindholm@...aro.org>,
	Dave Young <dyoung@...hat.com>, linux-kernel@...r.kernel.org,
	linux-efi@...r.kernel.org, x86@...nel.org, mjg59@...f.ucam.org,
	hpa@...or.com, James.Bottomley@...senPartnership.com,
	vgoyal@...hat.com, ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.infradead.org, bp@...en8.de, greg@...ah.com,
	toshi.kani@...com, Tony Luck <tony.luck@...il.com>
Subject: Re: [PATCH v5 02/14] efi: use early_memremap and early_memunmap

On Wed, 2013-12-11 at 11:32 +0000, Matt Fleming wrote:
> On Wed, 11 Dec, at 12:02:27PM, Leif Lindholm wrote:
> > On Wed, Dec 11, 2013 at 10:39:03AM +0000, Matt Fleming wrote:
> > > Leif, Mark, does this patch look OK for ARM? We'd need to introduce a
> > > new early_memunmap() function so that things still build, but that
> > > should be straight forward. You'd even be able to get rid of the
> > > asymmetry in uefi_init() where you map efi.systab with early_memremap()
> > > but unmap it with early_iounmap().
> > 
> > This patch looks splendid for ARM. As long as Mark can get the new
> > function into an update to the early_*remap() set, I can include this
> > in my next version - which is coming this week.
> 
> Great!
> 
> Oh and ia64 would also need early_memunmap(). Tony, the original patch
> is here,
> 

Couldn't ia64 just do:

  #define early_memremap(phys_addr, size) __va(phys_addr)
  #define early_memunmap(addr, size)

Anyway, I posted a patch to create a generic early_ioremap
implementation using generic bits of the x86 code:

  https://lkml.org/lkml/2013/11/27/621

So maybe Dave's patch 1/14 should be part of that series or
get rebased on top of it.

--Mark


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