From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A10432EEE61; Wed, 7 Oct 2026 00:50:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791334250; cv=none; b=IVanvD34uC1JLuB798KNh1eWHviBuK0iB0TqIz40sqGU1/QC8qhmIWujSuoKiAQqzzUNpqgmmOCBN5lKd2MU8+tLzw/Ovm1QcqBHj+Ioy83h3j+S1TtUZ/FR4u87INrLeBmuCt2HO//848HnlkGTvbJgcC2hzZgNoX+XUuHf5QY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791334250; c=relaxed/simple; bh=+KVGg2jLlwGhctb+89Cnyfpw63wUtSy+m1L1f3dPBwo=; h=Date:To:From:Subject:Message-Id; b=hSH1s7wjfTUDArB/r+QNwL6KqDBnrBR7kbsn2JcIL6t9IMRiverd5fukeLfebDgBAks7jXxaeyiPQM9T2vgMJ4CV8zvfIxoaW4WTAdqiddHJvULf1w+HVbV26xo5Bt0YFsU/kLUIxjfiehW+w8pr32AnB3rGqKCL09zmquUeLjQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=u04FNaVD; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="u04FNaVD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 719801F0089C; Wed, 7 Oct 2026 00:50:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791334249; bh=NuIZN8gS4JKJu7WnMNADd68eBV9zKlDllpskDeJqo3U=; h=Date:To:From:Subject; b=u04FNaVDzbgtDqqNONbfIxwqNunxpqETItVtiMdEV7wvp3UHg/t0wesMyMiuBBNX4 sfR+ryklKLek3W4YchauFIg6Pn5hV1Sjd0OchE2DQeLoluYvcBI070yCe3EiEl1mPR i7zDyodrRIL0jwn6m7S21Jakm5l5Gi8EUH8v+pTI= Date: Tue, 06 Oct 2026 17:50:49 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,ying.huang@linux.alibaba.com,vbabka@kernel.org,stable@vger.kernel.org,ryan.roberts@arm.com,rakie.kim@sk.com,matthew.brost@intel.com,ljs@kernel.org,liam@infradead.org,lance.yang@linux.dev,joshua.hahnjy@gmail.com,jannh@google.com,dev.jain@arm.com,david@kernel.org,byungchul@sk.com,baolin.wang@linux.alibaba.com,baohua@kernel.org,balbirs@nvidia.com,apopple@nvidia.com,gourry@gourry.net,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-huge_memory-skip-zone-device-folios-in-madvise_free_huge_pmd.patch removed from -mm tree Message-Id: <20261007005049.719801F0089C@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/huge_memory: skip zone device folios in madvise_free_huge_pmd() has been removed from the -mm tree. Its filename was mm-huge_memory-skip-zone-device-folios-in-madvise_free_huge_pmd.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Gregory Price Subject: mm/huge_memory: skip zone device folios in madvise_free_huge_pmd() Date: Mon, 17 Aug 2026 18:08:08 -0400 Patch series "mm: reject zone device folios in more folio walkers", v2. Several LRU-oriented mm walkers resolve the folio backing a PMD entry (or a physical pfn) and then reclaim, age, migrate, or lazyfree it without ever checking for ZONE_DEVICE memory. This series adds missing folio_is_zone_device() rejections, matching the checks that comparable walkers already perform. - mm/huge_memory, mm/madvise: the !pmd_present branch above these sites only filters device-private entries (which are non-present). A present zone device PMD (e.g. device-coherent) would still reach the folio and be lazyfreed / aged / paged out. Add an explicit check. - mm/mempolicy: queue_folios_pmd() can see a present zone device PMD (e.g. device-coherent) and queue it for migration. No crash reproducer - this is a correctness/hardening cleanup found by inspection. All checks are placed after the folio is resolved and before it is acted upon, on paths that already hold the relevant page-table lock, so no locking or refcount changes are involved. This patch (of 3): madvise_free_huge_pmd() resolves the folio backing a PMD via pmd_folio() and marks it lazyfree without checking for zone device memory. The surrounding guards do not cover every zone device case: - MADV_FREE only operates on anonymous VMAs (DAX mappings are excluded) - !pmd_present() branch rejects device-private and migration entries - present zone device PMD (device coherent THP) is not filtered. Unlike vm_normal_page_pmd(), it performs no special/pfnmap check, and would be marked lazyfree here. Bail out when the folio is a zone device folio. Link: https://lore.kernel.org/20260817220810.1175596-1-gourry@gourry.net Link: https://lore.kernel.org/20260817220810.1175596-2-gourry@gourry.net Fixes: a30b48bf1b24 ("mm/migrate_device: implement THP migration of zone device pages") Signed-off-by: Gregory Price (Meta) Signed-off-by: Andrew Morton Acked-by: David Hildenbrand (Arm) Reviewed-by: Lorenzo Stoakes (ARM) Tested-by: Lance Yang Cc: Alistair Popple Cc: Balbir Singh Cc: Baolin Wang Cc: Barry Song Cc: Byungchul Park Cc: Dev Jain Cc: "Huang, Ying" Cc: Jann Horn Cc: Joshua Hahn Cc: Liam R. Howlett Cc: Matthew Brost Cc: Rakie Kim Cc: Ryan Roberts Cc: Vlastimil Babka Cc: Zi Yan Cc: --- mm/huge_memory.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/mm/huge_memory.c~mm-huge_memory-skip-zone-device-folios-in-madvise_free_huge_pmd +++ a/mm/huge_memory.c @@ -2423,6 +2423,10 @@ bool madvise_free_huge_pmd(struct mmu_ga } folio = pmd_folio(orig_pmd); + + if (folio_is_zone_device(folio)) + goto out; + /* * If other processes are mapping this folio, we couldn't discard * the folio unless they all do MADV_FREE so let's skip the folio. _ Patches currently in -mm which might be from gourry@gourry.net are mm-memory_hotplug-factor-out-node_is_memoryless.patch mm-mempolicy-use-vm_normal_folio_pmd-in-queue_folios_pmd.patch mm-madvise-use-vm_normal_folio_pmd-in-cold-pageout-pmd-range.patch mm-refactor-find_next_best_node-to-find_next_best_node_in.patch mm-page_alloc-refactor-build_node_zonelist-out-of-build_zonelists.patch proc-task_mmu-handle-special-pmds-in-clear_refs-and-pagemap.patch mm-madvise-reclaim-isolated-folios-if-pte-restart-fails.patch mm-madvise-use-folio_trylock-in-the-cold-pageout-pmd-split.patch