[next-20150119]regression (mm)?
Peter Ujfalusi
peter.ujfalusi at ti.com
Wed Jan 21 01:23:19 PST 2015
On 01/20/2015 04:05 PM, Kirill A. Shutemov wrote:
> Russell King - ARM Linux wrote:
>> On Tue, Jan 20, 2015 at 02:16:43AM +0200, Kirill A. Shutemov wrote:
>>> Better option would be converting 2-lvl ARM configuration to
>>> <asm-generic/pgtable-nopmd.h>, but I'm not sure if it's possible.
>>
>> Well, IMHO the folded approach in asm-generic was done the wrong way
>> which barred ARM from ever using it.
>
> Okay, I see.
>
> Regarding the topic bug. Completely untested patch is below. Could anybody
> check if it helps?
>
> From 34b9182d08ef2b541829e305fcc91ef1d26b27ea Mon Sep 17 00:00:00 2001
> From: "Kirill A. Shutemov" <kirill.shutemov at linux.intel.com>
> Date: Tue, 20 Jan 2015 15:47:22 +0200
> Subject: [PATCH] arm: define __PAGETABLE_PMD_FOLDED for !LPAE
>
> ARM uses custom implementation of PMD folding in 2-level page table case.
> Generic code expects to see __PAGETABLE_PMD_FOLDED to be defined if PMD is
> folded, but ARM doesn't do this. Let's fix it.
>
> Defining __PAGETABLE_PMD_FOLDED will drop out unused __pmd_alloc().
> It also fixes problems with recently-introduced pmd accounting on ARM
> without LPAE.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov at linux.intel.com>
> Reported-by: Nishanth Menon <nm at ti.com>
> ---
> arch/arm/include/asm/pgtable-2level.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h
> index bcc5e300413f..bfd662e49a25 100644
> --- a/arch/arm/include/asm/pgtable-2level.h
> +++ b/arch/arm/include/asm/pgtable-2level.h
> @@ -10,6 +10,8 @@
> #ifndef _ASM_PGTABLE_2LEVEL_H
> #define _ASM_PGTABLE_2LEVEL_H
>
> +#define __PAGETABLE_PMD_FOLDED
> +
> /*
> * Hardware-wise, we have a two level page table structure, where the first
> * level has 4096 entries, and the second level has 256 entries. Each entry
>
Among other boards I have my daVinci board (OMAP-L138-EVM) boots fine with
this patch.
Tested-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
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