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

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Date:	Thu, 22 Jan 2015 12:33:06 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	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"

On Wed, Jan 21, 2015 at 10:37:20AM +0100, Geert Uytterhoeven wrote:
> 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>

Thanks, I have also tested the armadillo800eva and mackerel.

Tested-by: Simon Horman <horms+renesas@...ge.net.au>
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