linux-kernel - Re: [PATCH 1/4] hugetlbfs: add arch_hugetlb_valid

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Date:   Mon, 23 Mar 2020 16:43:19 -0700
From:   Mina Almasry <almasrymina@...gle.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Linux-MM <linux-mm@...ck.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-doc@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Longpeng <longpeng2@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/4] hugetlbfs: add arch_hugetlb_valid_size

On Wed, Mar 18, 2020 at 3:07 PM Mike Kravetz <mike.kravetz@...cle.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@...cle.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@...gle.com>