linux-kernel - Re: Possible regression in next-20150120 due to "mm: account pmd page tables to the process"

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Date:	Wed, 21 Jan 2015 10:37:20 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Simon Horman <horms@...ge.net.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Linux MM <linux-mm@...ck.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...nvz.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: Possible regression in next-20150120 due to "mm: account pmd page
 tables to the process"

Hi Kirill, Simon,

On Wed, Jan 21, 2015 at 10:29 AM, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
> Simon Horman wrote:
>> Hi,
>>
>> I have observed what appears to be a regression caused
>> by b316feb3c37ff19cd ("mm: account pmd page tables to the process").
>>
>> The problem that I am seeing is that when booting the kzm9g board, which is
>> based on the Renesas r8a73a4 ARM SoC, using its defconfig the following the

Renesas sh73a0 ARM SoC, FWIW...

>> tail boot log below is output repeatedly and the boot does not appear to
>> proceed any further.
>>
>> I have observed this problem using next-20150120 and observed
>> that it does not occur when the patch mentioned above is reverted.
>>
>> I have also observed what appears to be the same problem when
>> booting the following boards using their defconfigs. And perhaps
>> more to the point the problem appears to affect booting all
>> boards based on Renesas ARM SoCs for which there is working support
>> to boot them by initialising them using C (as opposed to device tree).
>>
>> * armadillo800eva, based on the r8a7740 SoC
>> * mackerel, based on the sh7372
>
> This should be fixed by this:
>
> http://marc.info/?l=linux-next&m=142176280218627&w=2
>
> Please, test.

Thanks!

Confirmed the issue, and confirmed the fix (on sh73a0/kzm9g-legacy).

Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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