From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
linux-parisc@vger.kernel.org, linux-mm@kvack.org
Subject: Re: 4.0-rc1/PARISC: BUG: non-zero nr_pmds on freeing mm
Date: Wed, 25 Feb 2015 22:47:43 +0200 [thread overview]
Message-ID: <20150225204743.GA31668@node.dhcp.inet.fi> (raw)
In-Reply-To: <20150225123048.a9c97ea726f747e029b4688a@linux-foundation.org>
On Wed, Feb 25, 2015 at 12:30:48PM -0800, Andrew Morton wrote:
> On Wed, 25 Feb 2015 22:21:30 +0200 "Kirill A. Shutemov" <kirill@shutemov.name> wrote:
>
> > On Wed, Feb 25, 2015 at 12:54:54AM +0200, Aaro Koskinen wrote:
> > > Hi,
> > >
> > > Here's a kernel config to reproduce the issue (no special steps needed,
> > > just boot to userspace), and bootlog after that:
> > >
> > > #
> > > # Automatically generated file; DO NOT EDIT.
> > > # Linux/parisc 4.0.0-rc1 Kernel Configuration
> > ...
> > > [ 18.940000] BUG: non-zero nr_pmds on freeing mm: -6
> >
> > It happens due missing __PAGETABLE_PMD_FOLDED in custom page table
> > folding. This has been fixed in CONFIG_PGTABLE_LEVELS patcheset.
> >
> > Andrew, are you going to submit that patchset to Linus in this cycle?
>
> I wasn't planning on doing so - the changelog didn't say anything about
> fixing any regressions.
My bad. Patch 18/19 of the patchset introduced assert which checks that
folded macros are not missed and fixed all cases which trigger it.
> > If not, I can prepare a patchset which only adds missing
> > __PAGETABLE_PUD_FOLDED and __PAGETABLE_PMD_FOLDED.
>
> Something simple would be preferred, but I don't know how much simpler
> the above would be?
Not much simplier: __PAGETABLE_PMD_FOLDED is missing in frv, m32r, m68k,
mn10300, parisc and s390.
--
Kirill A. Shutemov
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next prev parent reply other threads:[~2015-02-25 20:47 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-24 22:54 Aaro Koskinen
2015-02-25 20:21 ` Kirill A. Shutemov
2015-02-25 20:30 ` Andrew Morton
2015-02-25 20:47 ` Kirill A. Shutemov [this message]
2015-02-25 21:31 ` Andrew Morton
2015-02-25 21:57 ` Kirill A. Shutemov
2015-02-25 22:13 ` Andrew Morton
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