linux-kernel - Re: [PATCH v16 1/6] efi: ARM/arm64: ignore DT memory nodes instead of removing them

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Message-ID: <20160415140838.GL22906@arm.com>
Date:	Fri, 15 Apr 2016 15:08:38 +0100
From:	Will Deacon <will.deacon@....com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	David Daney <ddaney.cavm@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	Robert Richter <rrichter@...ium.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v16 1/6] efi: ARM/arm64: ignore DT memory nodes instead
 of removing them

On Fri, Apr 15, 2016 at 04:06:08PM +0200, Ard Biesheuvel wrote:
> On 15 April 2016 at 16:03, Will Deacon <will.deacon@....com> wrote:
> > On Fri, Apr 08, 2016 at 03:50:23PM -0700, David Daney wrote:
> >> From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> >>
> >> There are two problems with the UEFI stub DT memory node removal
> >> routine:
> >> - it deletes nodes as it traverses the tree, which happens to work
> >>   but is not supported, as deletion invalidates the node iterator;
> >> - deleting memory nodes entirely may discard annotations in the form
> >>   of additional properties on the nodes.
> >>
> >> Since the discovery of DT memory nodes occurs strictly before the
> >> UEFI init sequence, we can simply clear the memblock memory table
> >> before parsing the UEFI memory map. This way, it is no longer
> >> necessary to remove the nodes, so we can remove that logic from the
> >> stub as well.
> >>
> >> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> >> Signed-off-by: David Daney <david.daney@...ium.com>
> >> ---
> >>  drivers/firmware/efi/arm-init.c    |  8 ++++++++
> >>  drivers/firmware/efi/libstub/fdt.c | 24 +-----------------------
> >>  2 files changed, 9 insertions(+), 23 deletions(-)
> >
> > Matt, are you ok with me taking this through the arm64 tree? (since the
> > NUMA patches depend on it). If so, please can I have your ack?
> >
> 
> Matt gave his Reviewed-by for v15
> 
> http://www.gossamer-threads.com/lists/linux/kernel/2390242

Brill, thanks. Looks like it got dropped by accident for the latest posting.

Will