linux-kernel - Re: [PATCH V2] mm: Introduce GFP

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Date:   Wed, 16 Jan 2019 18:09:34 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Christophe Leroy <christophe.leroy@....fr>, linux-mm@...ck.org,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-sh@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, linux-riscv@...ts.infradead.org
Cc:     mark.rutland@....com, mhocko@...e.com, peterz@...radead.org,
        catalin.marinas@....com, dave.hansen@...ux.intel.com,
        will.deacon@....com, aneesh.kumar@...ux.ibm.com,
        linux@...linux.org.uk, mingo@...hat.com, rientjes@...gle.com,
        palmer@...ive.com, greentime@...estech.com, marc.zyngier@....com,
        rppt@...ux.vnet.ibm.com, shakeelb@...gle.com, kirill@...temov.name,
        tglx@...utronix.de, vbabka@...e.cz, ard.biesheuvel@...aro.org,
        steve.capper@....com, christoffer.dall@....com,
        james.morse@....com, robin.murphy@....com
Subject: Re: [PATCH V2] mm: Introduce GFP_PGTABLE



On 01/16/2019 12:40 PM, Christophe Leroy wrote:
> 
> 
> Le 16/01/2019 à 07:21, Anshuman Khandual a écrit :
>> All architectures have been defining their own PGALLOC_GFP as (GFP_KERNEL |
>> __GFP_ZERO) and using it for allocating page table pages. This causes some
>> code duplication which can be easily avoided. GFP_KERNEL allocated and
>> cleared out pages (__GFP_ZERO) are required for page tables on any given
>> architecture. This creates a new generic GFP flag flag which can be used
>> for any page table page allocation. Does not cause any functional change.
>>
>> GFP_PGTABLE is being added into include/asm-generic/pgtable.h which is the
>> generic page tabe header just to prevent it's potential misuse as a general
>> allocation flag if included in include/linux/gfp.h.
>>
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> ---
>> Build tested on arm, arm64, powerpc, powerpc64le and x86.
>> Boot tested on arm64 and x86.
>>
>> Changes in V2:
>>
>> - Moved GFP_PGTABLE into include/asm-generic/pgtable.h
>> - On X86 added __GFP_ACCOUNT into GFP_PGTABLE at various places
>> - Replaced possible flags on riscv and nds32 with GFP_PGTABLE
> 
> Could also replace the flags in arch/powerpc/include/asm/nohash/64/pgalloc.h with GFP_PGTABLE in pte_alloc_one_kernel() and pte_alloc_one()

Sure will do.