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From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Guenter Roeck <linux@roeck-us.net>
Cc: akpm@linux-foundation.org, mm-commits@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org, linux-next@vger.kernel.org,
	sfr@canb.auug.org.au, mhocko@suse.cz,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: mmotm 2015-01-22-15-04: qemu failures due to 'mm: account pmd page tables to the process'
Date: Fri, 23 Jan 2015 13:13:04 +0200
Message-ID: <20150123111304.GA5975@node.dhcp.inet.fi> (raw)
In-Reply-To: <20150123050445.GA22751@roeck-us.net>

On Thu, Jan 22, 2015 at 09:04:45PM -0800, Guenter Roeck wrote:
> On Thu, Jan 22, 2015 at 03:05:17PM -0800, akpm@linux-foundation.org wrote:
> > The mm-of-the-moment snapshot 2015-01-22-15-04 has been uploaded to
> > 
> >    http://www.ozlabs.org/~akpm/mmotm/
> > 
> qemu:sh fails to shut down.
> 
> bisect log:
> 
> # bad: [03586ad04b2170ee816e6936981cc7cd2aeba129] pci: test for unexpectedly disabled bridges
> # good: [ec6f34e5b552fb0a52e6aae1a5afbbb1605cc6cc] Linux 3.19-rc5
> git bisect start 'HEAD' 'v3.19-rc5'
> # bad: [d113ba21d15c7d3615fd88490d1197615bb39fc0] mm: remove lock validation check for MADV_FREE
> git bisect bad d113ba21d15c7d3615fd88490d1197615bb39fc0
> # good: [17351d1625a5030fa16f1346b77064c03b51f107] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags
> git bisect good 17351d1625a5030fa16f1346b77064c03b51f107
> # good: [ad18ad1fce6f241a9cbd4adfd6b16c9283181e39] memcg: add BUILD_BUG_ON() for string tables
> git bisect good ad18ad1fce6f241a9cbd4adfd6b16c9283181e39
> # bad: [aa7e7cbfa43b74f6faef04ff730b5098544a4f77] mm/compaction: enhance tracepoint output for compaction begin/end
> git bisect bad aa7e7cbfa43b74f6faef04ff730b5098544a4f77
> # good: [a40d0d2cf21e2714e9a6c842085148c938bf36ab] mm: memcontrol: remove unnecessary soft limit tree node test
> git bisect good a40d0d2cf21e2714e9a6c842085148c938bf36ab
> # good: [4ec4aa2e07c1d6eee61f6cace29401c6febcb6c5] mm: make FIRST_USER_ADDRESS unsigned long on all archs
> git bisect good 4ec4aa2e07c1d6eee61f6cace29401c6febcb6c5
> # bad: [22310c209483224a64436a6e815a86feda681659] mm: account pmd page tables to the process
> git bisect bad 22310c209483224a64436a6e815a86feda681659
> # good: [19a41261b1dcd8d12372d9c57c2035144608a599] arm: define __PAGETABLE_PMD_FOLDED for !LPAE
> git bisect good 19a41261b1dcd8d12372d9c57c2035144608a599
> # first bad commit: [22310c209483224a64436a6e815a86feda681659] mm: account pmd page tables to the process
> 
> ---
> 
> qemu:microblaze generates warnings to the console.
> 
> WARNING: CPU: 0 PID: 32 at mm/mmap.c:2858 exit_mmap+0x184/0x1a4()
> 
> with various call stacks. See
> http://server.roeck-us.net:8010/builders/qemu-microblaze-mmotm/builds/15/steps/qemubuildcommand/logs/stdio
> for details.

Could you try patch below? Completely untested.

>From b584bb8d493794f67484c0b57c161d61c02599bc Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Fri, 23 Jan 2015 13:08:26 +0200
Subject: [PATCH] microblaze: define __PAGETABLE_PMD_FOLDED

Microblaze uses custom implementation of PMD folding, but doesn't define
__PAGETABLE_PMD_FOLDED, which generic code expects to see. Let's fix it.

Defining __PAGETABLE_PMD_FOLDED will drop out unused __pmd_alloc().
It also fixes problems with recently-introduced pmd accounting.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
---
 arch/microblaze/include/asm/pgtable.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h
index 46637bb090eb..e53b8532353c 100644
--- a/arch/microblaze/include/asm/pgtable.h
+++ b/arch/microblaze/include/asm/pgtable.h
@@ -61,6 +61,8 @@ extern int mem_init_done;
 
 #include <asm-generic/4level-fixup.h>
 
+#define __PAGETABLE_PMD_FOLDED
+
 #ifdef __KERNEL__
 #ifndef __ASSEMBLY__
 
-- 
 Kirill A. Shutemov

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  reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-22 23:05 mmotm 2015-01-22-15-04 uploaded akpm
2015-01-23  5:04 ` mmotm 2015-01-22-15-04: qemu failures due to 'mm: account pmd page tables to the process' Guenter Roeck
2015-01-23 11:13   ` Kirill A. Shutemov [this message]
2015-01-23 15:07     ` Guenter Roeck
2015-01-23 21:55       ` Andrew Morton
2015-01-24  2:44         ` Guenter Roeck
2015-01-24  3:05           ` Guenter Roeck
2015-01-24  5:52         ` Guenter Roeck
2015-01-26 12:29           ` Kirill A. Shutemov
2015-01-26 14:03             ` Guenter Roeck
2015-01-26 14:17               ` Guenter Roeck
2015-01-27 16:16               ` Kirill A. Shutemov
2015-01-27 16:24                 ` Guenter Roeck
2015-01-27 21:24                   ` Andrew Morton
2015-01-28  6:16                     ` Guenter Roeck
2015-01-23  5:08 ` mmotm 2015-01-22-15-04: qemu failure due to 'mm: memcontrol: remove unnecessary soft limit tree node test' Guenter Roeck
2015-01-23 14:18   ` Johannes Weiner
2015-01-23 15:17     ` Christoph Lameter
2015-01-23 16:02       ` Johannes Weiner
2015-01-23 16:59         ` Guenter Roeck
2015-01-23 17:36           ` Johannes Weiner
2015-01-23 17:38             ` Johannes Weiner
2015-01-24  2:02             ` Guenter Roeck
2015-01-27 17:24       ` Michal Hocko
2015-01-28 15:03         ` Christoph Lameter
2015-01-23 15:46     ` Guenter Roeck
2015-01-23 16:03       ` Johannes Weiner
2015-01-23 20:20     ` Christoph Lameter
2015-01-23 20:33       ` Guenter Roeck
2015-01-23 21:09         ` Christoph Lameter
2015-01-24  7:16           ` Johannes Weiner
2015-01-25 21:36             ` Valdis.Kletnieks
2015-01-26 13:37               ` Johannes Weiner

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