linux-kernel - Re: [PATCH v3] ARM: mm: support big-endian page tables

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Date:	Wed, 23 Apr 2014 14:20:33 +0100
From:	Will Deacon <will.deacon@....com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Jianguo Wu <wujianguo@...wei.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Li Zefan <lizefan@...wei.com>, Wang Nan <wangnan0@...wei.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] ARM: mm: support big-endian page tables

Hi Jianguo,

On Thu, Apr 17, 2014 at 10:43:01AM +0100, Marc Zyngier wrote:
> On Thu, Apr 17 2014 at 10:31:37 am BST, Jianguo Wu <wujianguo@...wei.com> wrote:
> > When enable LPAE and big-endian in a hisilicon board, while specify
> > mem=384M mem=512M@...0M, will get bad page state:
> >
> > Freeing unused kernel memory: 180K (c0466000 - c0493000)
> > BUG: Bad page state in process init  pfn:fa442
> > page:c7749840 count:0 mapcount:-1 mapping:  (null) index:0x0
> > page flags: 0x40000400(reserved)
> > Modules linked in:
> > CPU: 0 PID: 1 Comm: init Not tainted 3.10.27+ #66
> > [<c000f5f0>] (unwind_backtrace+0x0/0x11c) from [<c000cbc4>] (show_stack+0x10/0x14)
> > [<c000cbc4>] (show_stack+0x10/0x14) from [<c009e448>] (bad_page+0xd4/0x104)
> > [<c009e448>] (bad_page+0xd4/0x104) from [<c009e520>] (free_pages_prepare+0xa8/0x14c)
> > [<c009e520>] (free_pages_prepare+0xa8/0x14c) from [<c009f8ec>] (free_hot_cold_page+0x18/0xf0)
> > [<c009f8ec>] (free_hot_cold_page+0x18/0xf0) from [<c00b5444>] (handle_pte_fault+0xcf4/0xdc8)
> > [<c00b5444>] (handle_pte_fault+0xcf4/0xdc8) from [<c00b6458>] (handle_mm_fault+0xf4/0x120)
> > [<c00b6458>] (handle_mm_fault+0xf4/0x120) from [<c0013754>] (do_page_fault+0xfc/0x354)
> > [<c0013754>] (do_page_fault+0xfc/0x354) from [<c0008400>] (do_DataAbort+0x2c/0x90)
> > [<c0008400>] (do_DataAbort+0x2c/0x90) from [<c0008fb4>] (__dabt_usr+0x34/0x40)


[...]

Please can you put this into Russell's patch system? You can also add my
ack:

  Acked-by: Will Deacon <will.deacon@....com>

You should also CC stable <stable@...r.kernel.org> in the commit log.

Cheers,

Will
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