linux-kernel - Re: [PATCH v5 18/22] powerpc/mm: Extend pte

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Date:   Wed, 26 Sep 2018 14:31:22 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Christophe LEROY <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        aneesh.kumar@...ux.vnet.ibm.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v5 18/22] powerpc/mm: Extend pte_fragment functionality to
 nohash/32

On 9/26/18 1:40 PM, Christophe LEROY wrote:
> 
> 
> Le 26/09/2018 à 04:48, Aneesh Kumar K.V a écrit :
>> Christophe Leroy <christophe.leroy@....fr> writes:
>>
>>> In order to allow the 8xx to handle pte_fragments, this patch
>>> extends the use of pte_fragments to nohash/32 platforms.
>>>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>>> ---
>>>   arch/powerpc/include/asm/mmu_context.h       |  2 +-
>>>   arch/powerpc/include/asm/nohash/32/mmu-40x.h |  1 +
>>>   arch/powerpc/include/asm/nohash/32/mmu-44x.h |  1 +
>>>   arch/powerpc/include/asm/nohash/32/mmu-8xx.h |  1 +
>>>   arch/powerpc/include/asm/nohash/32/mmu.h     |  4 ++-
>>>   arch/powerpc/include/asm/nohash/32/pgalloc.h | 52 
>>> +++++++++++++---------------
>>>   arch/powerpc/include/asm/nohash/32/pgtable.h | 11 ++++--
>>>   arch/powerpc/include/asm/nohash/mmu-book3e.h |  1 +
>>>   arch/powerpc/mm/Makefile                     |  3 ++
>>>   arch/powerpc/mm/mmu_context_nohash.c         | 14 ++++++++
>>>   10 files changed, 57 insertions(+), 33 deletions(-)
>>>
>>> diff --git a/arch/powerpc/include/asm/mmu_context.h 
>>> b/arch/powerpc/include/asm/mmu_context.h
>>> index b2f89b621b15..7f2c37a3f99d 100644
>>> --- a/arch/powerpc/include/asm/mmu_context.h
>>> +++ b/arch/powerpc/include/asm/mmu_context.h
>>> @@ -222,7 +222,7 @@ static inline int arch_dup_mmap(struct mm_struct 
>>> *oldmm,
>>>       return 0;
>>>   }
>>> -#ifndef CONFIG_PPC_BOOK3S_64
>>> +#if defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_BOOK3S_32)
>>>   static inline void arch_exit_mmap(struct mm_struct *mm)
>>>   {
>>>   }
>>
>>
>> Can we do that with #ifndef arch_exit_mmap? This should handle every
>> platform that doesn't use pte_frag right?
> 
> Yes we can, that means moving arch_exit_mmap() prototype in platform 
> specific mmu headers, and adding there a #define arch_exit_mmap 
> arch_exit_mmap
> 
> Is that your idea ?
> 

yes. that way it is easy to find out which platforms really want that to 
be a different.

-aneesh