linux-kernel - Re: [PATCH 1/1] arm64: mm: add config options for page table configuration

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Message-ID: <9c613ead-d215-3e53-40bf-126be3f1ad3e@broadcom.com>
Date:   Fri, 9 Dec 2016 21:20:01 -0800
From:   Scott Branden <scott.branden@...adcom.com>
To:     Will Deacon <will.deacon@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Olof Johansson <olof@...om.net>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/1] arm64: mm: add config options for page table
 configuration

Hi Will,

On 16-12-09 02:57 AM, Will Deacon wrote:
> On Thu, Dec 08, 2016 at 11:33:39AM -0800, Scott Branden wrote:
>> Since I currently have your attention:  I do think there is fundamental bug
>> in the ARM64 mm implementation.  If you look at /sys/devices/system/memory
>> it only shows the last memoryX section created after init.
>
> That directory doesn't seem to exist on my arm64 systems. Do I have to
> enable something specific in the .config?
I looked in the /sys/devices/system/memory at it doesn't look like it 
appears until memory hotplug is enabled in the system.  This is another 
patch I'm trying to work through at the same time:
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1284943.html

The internals of the memory management subsystem is not something I'm 
too familiar with at this point.
>
> Will
>
Regards,
Scott