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From:   Mina Almasry <almasrymina@google.com>
Date:   Mon, 23 Mar 2020 16:43:19 -0700
Message-ID: <CAHS8izMnxF9e-QDmA1WL4Kjgt=Uu0Xk64WZB1-bbvO4A+2fZiA@mail.gmail.com>
Subject: Re: [PATCH 1/4] hugetlbfs: add arch_hugetlb_valid_size
To:     Mike Kravetz <mike.kravetz@oracle.com>
Cc:     Linux-MM <linux-mm@kvack.org>,
        open list <linux-kernel@vger.kernel.org>,
        linux-arm-kernel@lists.infradead.org,
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On Wed, Mar 18, 2020 at 3:07 PM Mike Kravetz <mike.kravetz@oracle.com> wrote:
>
> The architecture independent routine hugetlb_default_setup sets up
> the default huge pages size.  It has no way to verify if the passed
> value is valid, so it accepts it and attempts to validate at a later
> time.  This requires undocumented cooperation between the arch specific
> and arch independent code.
>
> For architectures that support more than one huge page size, provide
> a routine arch_hugetlb_valid_size to validate a huge page size.
> hugetlb_default_setup can use this to validate passed values.
>
> arch_hugetlb_valid_size will also be used in a subsequent patch to
> move processing of the "hugepagesz=" in arch specific code to a common
> routine in arch independent code.
>
> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
> ---
>  arch/arm64/include/asm/hugetlb.h   |  2 ++
>  arch/arm64/mm/hugetlbpage.c        | 19 ++++++++++++++-----
>  arch/powerpc/include/asm/hugetlb.h |  3 +++
>  arch/powerpc/mm/hugetlbpage.c      | 20 +++++++++++++-------
>  arch/riscv/include/asm/hugetlb.h   |  3 +++
>  arch/riscv/mm/hugetlbpage.c        | 28 ++++++++++++++++++----------
>  arch/s390/include/asm/hugetlb.h    |  3 +++
>  arch/s390/mm/hugetlbpage.c         | 18 +++++++++++++-----
>  arch/sparc/include/asm/hugetlb.h   |  3 +++
>  arch/sparc/mm/init_64.c            | 23 ++++++++++++++++-------
>  arch/x86/include/asm/hugetlb.h     |  3 +++
>  arch/x86/mm/hugetlbpage.c          | 21 +++++++++++++++------
>  include/linux/hugetlb.h            |  7 +++++++
>  mm/hugetlb.c                       | 16 +++++++++++++---
>  14 files changed, 126 insertions(+), 43 deletions(-)
>

With build fixes:
Acked-by: Mina Almasry <almasrymina@google.com>