linux-kernel - Re: [RFC PATCH v2 09/47] hugetlb: make huge_pte

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Date:   Mon, 12 Dec 2022 16:25:48 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     James Houghton <jthoughton@...gle.com>
Cc:     Muchun Song <songmuchun@...edance.com>,
        Peter Xu <peterx@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Zach O'Keefe <zokeefe@...gle.com>,
        Manish Mishra <manish.mishra@...anix.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Yang Shi <shy828301@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 09/47] hugetlb: make huge_pte_lockptr take an
 explicit shift argument.

On 10/21/22 16:36, James Houghton wrote:
> This is needed to handle PTL locking with high-granularity mapping. We
> won't always be using the PMD-level PTL even if we're using the 2M
> hugepage hstate. It's possible that we're dealing with 4K PTEs, in which
> case, we need to lock the PTL for the 4K PTE.
> 
> Signed-off-by: James Houghton <jthoughton@...gle.com>
> ---
>  arch/powerpc/mm/pgtable.c | 3 ++-
>  include/linux/hugetlb.h   | 9 ++++-----
>  mm/hugetlb.c              | 7 ++++---
>  mm/migrate.c              | 3 ++-
>  4 files changed, 12 insertions(+), 10 deletions(-)

Straight forward substitution,

Acked-by: Mike Kravetz <mike.kravetz@...cle.com>

-- 
Mike Kravetz