linux-kernel - Re: [PATCH v2 9/9] powerpc/hugetlb: Enable hugetlb migration for ppc64

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Date:   Thu, 26 Apr 2018 12:35:55 +0200
From:   Christophe LEROY <christophe.leroy@....fr>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        mpe@...erman.id.au
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 9/9] powerpc/hugetlb: Enable hugetlb migration for
 ppc64



Le 16/05/2017 à 11:23, Aneesh Kumar K.V a écrit :
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
>   arch/powerpc/platforms/Kconfig.cputype | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
> index 80175000042d..8acc4f27d101 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -351,6 +351,11 @@ config PPC_RADIX_MMU
>   	  is only implemented by IBM Power9 CPUs, if you don't have one of them
>   	  you can probably disable this.
>   
> +config ARCH_ENABLE_HUGEPAGE_MIGRATION
> +	def_bool y
> +	depends on PPC_BOOK3S_64 && HUGETLB_PAGE && MIGRATION
> +
> +

Is there a reason why you redefine ARCH_ENABLE_HUGEPAGE_MIGRATION 
instead of doing a 'select' as it is already defined in mm/Kconfig ?

Christophe

>   config PPC_MMU_NOHASH
>   	def_bool y
>   	depends on !PPC_STD_MMU
>