linux-kernel - Re: [PATCH] mm: Generalize HUGETLB_PAGE_SIZE

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Date:   Mon, 1 Mar 2021 07:23:58 +0100
From:   Christoph Hellwig <hch@....de>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-mm@...ck.org, Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>, linux-ia64@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Generalize HUGETLB_PAGE_SIZE_VARIABLE

On Mon, Mar 01, 2021 at 11:20:53AM +0530, Anshuman Khandual wrote:
> HUGETLB_PAGE_SIZE_VARIABLE need not be defined for each individual
> platform subscribing it. Instead just make it generic.
> 
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Christoph Hellwig <hch@....de>
> Cc: linux-ia64@...r.kernel.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> Suggested-by: Christoph Hellwig <hch@....de>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
> This change was originally suggested in an earilier discussion. This
> applies on v5.12-rc1 and has been build tested on all applicable
> platforms i.e ia64 and powerpc.
> 
> https://patchwork.kernel.org/project/linux-mm/patch/1613024531-19040-3-git-send-email-anshuman.khandual@arm.com/
> 
>  arch/ia64/Kconfig    | 6 +-----
>  arch/powerpc/Kconfig | 6 +-----
>  mm/Kconfig           | 8 ++++++++
>  3 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
> index 2ad7a8d29fcc..6b3e3f6c29ae 100644
> --- a/arch/ia64/Kconfig
> +++ b/arch/ia64/Kconfig
> @@ -32,6 +32,7 @@ config IA64
>  	select TTY
>  	select HAVE_ARCH_TRACEHOOK
>  	select HAVE_VIRT_CPU_ACCOUNTING
> +	select HUGETLB_PAGE_SIZE_VARIABLE

doesn't this need a 'if HUGETLB_PAGE'

or did you verify that HUGETLB_PAGE_SIZE_VARIABLE checks are always
nested inside of HUGETLB_PAGE ones?