linux-kernel - [PATCH 0/2] Fixes for hugetlb mapcount at most 1 for shared PMDs

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Date:   Thu, 26 Jan 2023 14:27:19 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        James Houghton <jthoughton@...gle.com>,
        Peter Xu <peterx@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Michal Hocko <mhocko@...e.com>, Yang Shi <shy828301@...il.com>,
        Vishal Moola <vishal.moola@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Muchun Song <songmuchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: [PATCH 0/2] Fixes for hugetlb mapcount at most 1 for shared PMDs

This issue of mapcount in hugetlb pages referenced by shared PMDs was
discussed in [1].  The following two patches address user visible
behavior caused by this issue.

Patches apply to mm-stable as they can also target stable backports.

Ongoing folio conversions cause context conflicts in the second patch
when applied to mm-unstable/linux-next.  I can create separate patch(es)
if people agree with these.

[1] https://lore.kernel.org/linux-mm/Y9BF+OCdWnCSilEu@monkey/
Mike Kravetz (2):
  mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
  migrate: hugetlb: Check for hugetlb shared PMD in node migration

 fs/proc/task_mmu.c      | 10 ++++++++--
 include/linux/hugetlb.h | 12 ++++++++++++
 mm/mempolicy.c          |  3 ++-
 3 files changed, 22 insertions(+), 3 deletions(-)

-- 
2.39.1