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b=ZRQj+0Z+xmjQDy7Gh1FpYKpwRI5gTMmaLTgEUNpjiE4drKJA1sUVKEgZiIheDcNfY rlZ8Rjn32bl+hR2oRNX2+FdmMJKBDFVjTBBzYnX5wO91q3cHZPvWvEAweJ8SWQtJlr Bs3krNJd/1KYRXoyDY5/bBCmBdOwBYLk7B310IBpcK06yAnFAHI8mTsjCYCZ3x/+eD HR0JgBwOpINJkPwRHftweSKDvpiqEPntdZEyGL5cQceQMCIGs3MYbqdRBL/AbK62bM s2MTUySTsZbAKNuTJh7GQ9OrtWkjaQnsEkkQH+sMO5PrKr3dWoE2HcyoE4Zv5BSlYr 5IORZp81aGVCA== 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 , James Houghton Subject: [PATCH 5.10.y 0/7] mm/hugetlb: fixes for PMD table sharing (incl. using mmu_gather) Date: Wed, 18 Feb 2026 14:05:45 +0100 Message-ID: <20260218130552.55727-1-david@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <2026012610-absolve-ducktail-3c64@gregkh> References: <2026012610-absolve-ducktail-3c64@gregkh> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: cc3jgs9w7guo41ncrsjpdzyp58cfraax X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 0A2271A000D X-HE-Tag: 1771419961-668789 X-HE-Meta: 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 RdmSMhDJ NEn+FLd9COTKb3REiDMpLDQc4PPzkFYnnByQqsAjWYEyCUUqmrilL+GLj8JAH4tOn1hVYTLQ8oBJY34qyxPxqsdHCVWBx81V3OSE45yqJb8low2XY7fkGeEdFIlBJgQldufyXpFEpm+tvLFH9jhI3GJ55Gg/Bij9umOZU2Nv9Hc5Lq4bg5QwjXGtNHcMggWUGlpd7E+68+p1BHIfGh+ThqzysnM69XSyMx++K08Pf8qMmLIVsyVsZeNUJSyfp4AKC4PmYnDqne7bVCC+mFDDKbDd/t+cgUVOYDrnEcD8aedU37oqDgoRU11+Qw3ziCqNK3dBsommyJHc6G0xr/jbLOgvsvu2PnjC03EPLhGH//lkk9pgR4F3L7y9sd3BMlsxnPppVjR7xQf3/BiPZSdleK7iE8JRx5vHbJ+6zIKAsRm9kzslj4GriU44Auy5qVw5MSUVEJNRrZ+cGDAXVyzbtS7bNm7nIuO54absGGyOQN6qpbng= 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 5.10. Backport notes are in the individual patches. I found one bug in a previous backport, fix in patch #1. 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 Cc: James Houghton David Hildenbrand (Arm) (1): mm/hugetlb: fix skipping of unsharing of pmd page tables 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 | 2 + mm/hugetlb.c | 143 ++++++++++++++++++++------------------ mm/mmu_gather.c | 36 ++++++++++ mm/rmap.c | 20 +++--- 6 files changed, 208 insertions(+), 87 deletions(-) -- 2.43.0