linux-kernel - Re: [PATCH v2 0/5] beautify EFI memmap logs

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Date:	Wed, 3 Sep 2014 14:18:18 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	Laszlo Ersek <lersek@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Mark Salter <msalter@...hat.com>
Subject: Re: [PATCH v2 0/5] beautify EFI memmap logs

On Wed, 03 Sep, at 03:01:31PM, Ard Biesheuvel wrote:
> 
> Tested-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> (on arm64 only)
> 
> +1 for aligning between architectures
> +1 for cleaning up the output to make it more readable
 
Thanks Ard.

> The only thing I am not entirely convinced about is printing all those
> memory attributes: is it really so interesting to know that region X
> /can/ be configured as writeback, write through, write combining etc
> etc, as most regions seem to support most attributes, yet it tells you
> nothing about what the kernel ends up doing with that information. In
> the arm64 case, for instance, all MEMORY_WB ranges are mapped
> writeback cached, and everything else is mapped uncached.

Personally, I think it's good to get an unadulterated version of the
firmware memory map (for vicarious debugging) before the kernel has a
chance to mess with it.

-- 
Matt Fleming, Intel Open Source Technology Center
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