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b=OvKF2VaKO2Dz6w3eX8jyUU1+okXBCC6EXvOSh0IgzZfIwS4ZUBC9lBQhKdlFnmACH vK2XShx0XzVjD7yxKoVkqcZ2NTIwHR/kWoV6LOyBIXSPe8smKmCKB0DER6+j2QqGp2 P8QQ3l31Kb3n/f/tXlVms/6eZjdkg7ImJaclnETudLInb2ulgW7i7xUhsmFtciax/H t9OHvMLLA3+NQhLJo3aYTaph2GrWcTQizaUk8QFE8VXSL1qaBVBC49So0+/sUQe9FZ 9D8GFqFQIIbo7SSjFSIw1X19E85CE9KcVVBl5r59aY/CfpbkO9ySiQah0Md1ebVS79 N9f6z95oCpZkQ== From: "David Hildenbrand (Arm)" To: stable@vger.kernel.org Cc: linux-mm@kvack.org, "David Hildenbrand (Arm)" , Jane Chu , Harry Yoo , Oscar Salvador , Jann Horn , Liu Shixin , Muchun Song , Andrew Morton , Rik van Riel , Laurence Oberman , Lance Yang , Miaohe Lin Subject: [PATCH 5.15.y 0/6] mm/hugetlb: fixes for PMD table sharing (incl. using mmu_gather) Date: Wed, 18 Feb 2026 12:01:23 +0100 Message-ID: <20260218110129.41578-1-david@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <2026012608-tulip-moisten-c6f6@gregkh> References: <2026012608-tulip-moisten-c6f6@gregkh> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 04596A0009 X-Rspamd-Server: rspam02 X-Stat-Signature: q7m9mzzudo7xb7r1faaikkt3tpfg6sjz X-HE-Tag: 1771412497-872482 X-HE-Meta: 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 c2CcVpuW /wQLIjivBPzjpdoamB/Tn+mcp1r+4zLgp0JUgjKfWvL19sWWaStTYyaKDGH8uqejbx/VUBLcO+gnSOH25YprnoYxtHMR7g4zUbfspTq/5U/oQ5+bw6yspNVooZQBGQOP9w+ihC4paNal6HDN33k4ARoe6hNl033hX+n4gCJ3MFgtv18+bkVTBvI5f9zy6YDjViFWhoPoQMQIckrRDHJqVJVjXlY3oK/7I9DIaYkvH6tA6a06pxgUQw91K6BlnScH+4GgCJ4HawpHMP/D32B4cjsv1WY+hK/WUZ35u1Q0muTBWxOv6LxuxA7aogJkqr8bAQwcpDB3hflg4RXO33zbBDRZyuM5vxZnGJnnykAYx8RaOFFRUgkErSxV/XP7NMPbZNHn2y4tfyUb9FpQXtShyhdT51fkFlPPhBiG5q6hoF5+r/D+oGag25nWw817qry1JGZscLL7eHR55aIlCfl39EfUgFfx46j4IZM4jOzFPpctuAp8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Backport of [1] for 5.15. Backport notes are in the individual patches. I'm also including a cleanup/fix from Miaohe that makes backporting at least a bit easier, followed by the fix from Jane. Tested on x86-64 with the original reproducer. [1] https://lore.kernel.org/linux-mm/20251223214037.580860-1-david@kernel.org/ Cc: Jane Chu Cc: Harry Yoo Cc: Oscar Salvador Cc: Jann Horn Cc: Liu Shixin Cc: Muchun Song Cc: Andrew Morton Cc: Rik van Riel Cc: Laurence Oberman Cc: Lance Yang Cc: Liu Shixin Cc: Miaohe Lin David Hildenbrand (Red Hat) (4): mm/hugetlb: fix hugetlb_pmd_shared() mm/hugetlb: fix two comments related to huge_pmd_unshare() mm/rmap: fix two comments related to huge_pmd_unshare() mm/hugetlb: fix excessive IPI broadcasts when unsharing PMD tables using mmu_gather Jane Chu (1): mm/hugetlb: fix copy_hugetlb_page_range() to use ->pt_share_count Miaohe Lin (1): mm/hugetlb: make detecting shared pte more reliable include/asm-generic/tlb.h | 77 ++++++++++++++++++++- include/linux/hugetlb.h | 17 +++-- include/linux/mm_types.h | 1 + mm/hugetlb.c | 141 +++++++++++++++++++------------------- mm/mmu_gather.c | 33 +++++++++ mm/rmap.c | 38 +++++----- 6 files changed, 210 insertions(+), 97 deletions(-) -- 2.43.0