linux-kernel - [PATCH 0/3] Fix some issues when looking up hugetlb page

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Date:   Fri, 19 Aug 2022 18:12:55 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     akpm@...ux-foundation.org, songmuchun@...edance.com,
        mike.kravetz@...cle.com
Cc:     baolin.wang@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] Fix some issues when looking up hugetlb page

Hi,

On ARM64 architecture, it can support CONT-PTE/PMD size hugetlb. When
looking up hugetlb page by follow_page(), we will hold the incorrect
pte/pmd lock for the CONT-PTE/PMD size hugetlb page, which will make
the pte/pmd entry unstable even under the lock and cause some potential
race issues. So considering the CONT-PTE/PMD size hugetlb, this patch set
changes to use the correct function to get the correct pte/pmd entry lock
to make the pte/pmd entry stable.

Baolin Wang (3):
  mm/gup: fix races when looking up a CONT-PTE size hugetlb page
  mm/hugetlb: fix races when looking up a CONT-PMD size hugetlb page
  mm/hugetlb: add FOLL_MIGRATION validation before waiting for a
    migration entry

 include/linux/hugetlb.h |  4 ++--
 mm/gup.c                | 24 +++++++++++++++++++++---
 mm/hugetlb.c            | 17 ++++++++++++++---
 3 files changed, 37 insertions(+), 8 deletions(-)

-- 
1.8.3.1