linux-kernel - [PATCH v2 0/3] Fix cache flush issues considering PMD sharing

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Message-Id: <cover.1651056365.git.baolin.wang@linux.alibaba.com>
Date:   Wed, 27 Apr 2022 18:52:04 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     akpm@...ux-foundation.org, mike.kravetz@...cle.com
Cc:     almasrymina@...gle.com, songmuchun@...edance.com,
        baolin.wang@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] Fix cache flush issues considering PMD sharing

Hi,

This patch set fixes some cache flushing issues if PMD sharing is
possible for hugetlb pages, which were found by code inspection.
Meanwhile Mike found the flush_cache_page() can not cover the whole
size of a hugetlb page on some architectures [1], so I added a new
patch 3 to fix this issue, since I found only try_to_unmap_one()
and try_to_migrate_one() need to fix after some investigation.

Please help to review. Thanks.

[1] https://lore.kernel.org/linux-mm/064da3bb-5b4b-7332-a722-c5a541128705@oracle.com/

Changes from v1:
 - Add reviewed-by tag from Mike.
 - Update some comments suggested by Mike.
 - Add a new patch to fix cache issue for hugetlb page.

Baolin Wang (3):
  mm: hugetlb: Considering PMD sharing when flushing cache/TLBs
  mm: rmap: Move the cache flushing to the correct place for hugetlb PMD
    sharing
  mm: rmap: Use flush_cache_range() to flush cache for hugetlb pages

 mm/hugetlb.c |  17 ++++++++-
 mm/mremap.c  |   2 +-
 mm/rmap.c    | 118 ++++++++++++++++++++++++++++++++---------------------------
 3 files changed, 80 insertions(+), 57 deletions(-)

-- 
1.8.3.1