linux-kernel - Re: arm64/efi handling of persistent memory

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Message-ID: <20151218121139.GM25034@bivouac.eciton.net>
Date:	Fri, 18 Dec 2015 12:11:39 +0000
From:	Leif Lindholm <leif.lindholm@...aro.org>
To:	Mark Rutland <mark.rutland@....com>
Cc:	"ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
	"matt@...eblueprint.co.uk" <matt@...eblueprint.co.uk>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"Elliott, Robert (Persistent Memory)" <elliott@....com>,
	"Kani, Toshimitsu" <toshi.kani@....com>,
	"Knippers, Linda" <linda.knippers@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"will.deacon@....com" <will.deacon@....com>,
	linux-efi@...r.kernel.org
Subject: Re: arm64/efi handling of persistent memory

On Fri, Dec 18, 2015 at 11:52:24AM +0000, Mark Rutland wrote:
> On Fri, Dec 18, 2015 at 11:06:51AM +0000, Leif Lindholm wrote:
> > On Fri, Dec 18, 2015 at 01:33:25AM +0000, Elliott, Robert (Persistent Memory) wrote:
> > > Similar to the questions about the arm64 efi boot stub
> > > handing persistent memory, some of the arm64 kernel code 
> > > looks fishy.
> 
> [...]
> 
> > > 2. is_reserve_region() treating EFI_PERSISTENT_MEMORY the same
> > > as EFI_CONVENTIONAL_MEMORY looks wrong.
> > 
> > Yeah... That one was introduced by
> > ad5fb870c486 ("e820, efi: add ACPI 6.0 persistent memory types")
> > without any ACKs from ARM people :/
> 
> Do we need to do anythign to avoid his kind of thing in future? e.g. a
> MAINTAINERS patch for the ARM EFI bits?

We've not needed that sort of thing in the past.
And running get_maintainer.pl on ad5fb870c486 does yield Catalin,
Will, Matt Fleming, you, Ard, me, lakml and linux-efi.

> Or do we just need to pay attention to linux-efi?

While I am certainly guilty of not watching that closely enough, I
can't actually find that patch in my linux-efi history. Or lakml.

/
    Leif
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