linux-kernel - [PATCH v2 0/5] Fix some issues when looking up hugetlb page

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Message-Id: <cover.1661240170.git.baolin.wang@linux.alibaba.com>
Date:   Tue, 23 Aug 2022 15:50:00 +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 v2 0/5] 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.

Changes from v1:
 - Introduce a new helper to handle the CONT-PTE page.
 - Use finer grained locks for CONT-PTE/PMD entries.
 - Update some commit message.

Baolin Wang (5):
  mm/hugetlb: fix races when looking up a CONT-PTE size hugetlb page
  mm/hugetlb: use PTE page lock to protect CONT-PTE entries
  mm/hugetlb: fix races when looking up a CONT-PMD size hugetlb page
  mm/hugetlb: use PMD page lock to protect CONT-PTE entries
  mm/hugetlb: add FOLL_MIGRATION validation before waiting for a
    migration entry

 include/linux/hugetlb.h | 38 ++++++++++++++++++++++++---
 mm/gup.c                | 13 ++++++++-
 mm/hugetlb.c            | 70 ++++++++++++++++++++++++++++++++++++++++++++++---
 3 files changed, 113 insertions(+), 8 deletions(-)

-- 
1.8.3.1