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 70249336892; Fri, 31 Jul 2026 02:43:40 +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=1785465822; cv=none; b=Kau4djMlAkf1XIelojQCnCPREiYHUGPSFCQ78KyrvopjV6jL+bhLfdUmouZsoWX/jHi0ozrr7Q9BjGElvji6248Q6P+W8YBRFwcs3zRCNcHLx5dHP1BXbX55ZhuXtiKcdAXm7PFNMt4TA53V34x/EjaPZGtWkh+ck5C8+TK9kaM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785465822; c=relaxed/simple; bh=zjoGXEkwseiMl62hNKoDUd26Vxn23yI/oLGbdSJd9WM=; h=Date:To:From:Subject:Message-Id; b=Vtqoi4BFmL4gyqY2rQfBoHOM8mEOsQbKUoHpP1WPl6Fxirb2wVdqq0e1xnYiADcAsMW/aJ6nmglWaoFSJFAm+hTUxvsJv59QA313kOhgdBMOCda16PzUm/00OwRWbtWamzbsPnvsqhnjOUPPSrIQg0FAYOGjDFIvTQ5PkC2UuaY= 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=Zp9hQ3lN; 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="Zp9hQ3lN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45F2D1F00A3D; Fri, 31 Jul 2026 02:43:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1785465820; bh=wgKYcIGjrSs+AHRJ6fqxZkxRVSpBZynBxW0JZa8tme8=; h=Date:To:From:Subject; b=Zp9hQ3lNKdbgMPw0ueLi7bKwkpC9Ial74iQ+dMVr53IcpjhgTqoDC212bKuGZOF09 EXJFh71rYvmwfDmUdrgcWV8yscNlHm7jExlyOuUUWemRyR6ynhwnZqt9CM/z9oRWgW Le8MxEl0bJiKAJK52eaxClf80JzxAdMbbg1Hv/7M= Date: Thu, 30 Jul 2026 19:43:39 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,ying.huang@linux.alibaba.com,will@kernel.org,vbabka@kernel.org,stable@vger.kernel.org,ryan.roberts@arm.com,riel@surriel.com,rcampbell@nvidia.com,rakie.kim@sk.com,pfalcato@suse.de,osalvador@suse.de,nao.horiguchi@gmail.com,muchun.song@linux.dev,mel@csn.ul.ie,matthew.brost@intel.com,ljs@kernel.org,liam@infradead.org,lance.yang@linux.dev,kas@kernel.org,jpoimboe@kernel.org,joshua.hahnjy@gmail.com,j-nomura@ce.jp.nec.com,jannh@google.com,harry@kernel.org,gourry@gourry.net,david@kernel.org,dave.hansen@intel.com,catalin.marinas@arm.com,byungchul@sk.com,apopple@nvidia.com,anshuman.khandual@arm.com,ak@linux.intel.com,dev.jain@arm.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-migrate-use-huge_ptep_get-in-remove_migration_pte.patch removed from -mm tree Message-Id: <20260731024340.45F2D1F00A3D@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/migrate: use huge_ptep_get() in remove_migration_pte() has been removed from the -mm tree. Its filename was mm-migrate-use-huge_ptep_get-in-remove_migration_pte.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: Dev Jain Subject: mm/migrate: use huge_ptep_get() in remove_migration_pte() Date: Fri, 3 Jul 2026 11:41:57 +0000 remove_migration_pte() converts migration entries back to present PTEs after folio migration completes. For hugetlb folios, page_vma_mapped_walk() returns the pte pointer to the hugetlb folio in pvmw.pte, but the code reads it with ptep_get(). On arches which provide their own huge_ptep_get() to dereference a huge pte pointer, accessing via ptep_get() would cause pte_pfn(), pte_present() etc to misbehave. It is not clear whether this has a trivially visible effect to userspace. Use huge_ptep_get() to dereference a huge pte pointer. Link: https://lore.kernel.org/20260703114202.365553-5-dev.jain@arm.com Fixes: 290408d4a250 ("hugetlb: hugepage migration core") Signed-off-by: Dev Jain Acked-by: Muchun Song Acked-by: David Hildenbrand (Arm) Cc: Alistair Popple Cc: Andi Kleen Cc: Anshuman Khandual Cc: Byungchul Park Cc: Catalin Marinas Cc: Dave Hansen Cc: Gregory Price Cc: Harry Yoo Cc: "Huang, Ying" Cc: Jann Horn Cc: Josh Poimboeuf Cc: Joshua Hahn Cc: Jun'ichi "Nick" Nomura Cc: Kiryl Shutsemau Cc: Lance Yang Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Matthew Brost Cc: Mel Gorman Cc: Naoya Horiguchi Cc: Oscar Salvador Cc: Pedro Falcato Cc: Rakie Kim Cc: Ralph Campbell Cc: Rik van Riel Cc: Ryan Roberts Cc: Vlastimil Babka Cc: Will Deacon Cc: Zi Yan Cc: Signed-off-by: Andrew Morton --- mm/migrate.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/mm/migrate.c~mm-migrate-use-huge_ptep_get-in-remove_migration_pte +++ a/mm/migrate.c @@ -372,7 +372,11 @@ static bool remove_migration_pte(struct continue; } #endif - old_pte = ptep_get(pvmw.pte); + if (folio_test_hugetlb(folio)) + old_pte = huge_ptep_get(vma->vm_mm, pvmw.address, + pvmw.pte); + else + old_pte = ptep_get(pvmw.pte); if (rmap_walk_arg->map_unused_to_zeropage && try_to_map_unused_to_zeropage(&pvmw, folio, old_pte, idx)) continue; _ Patches currently in -mm which might be from dev.jain@arm.com are mm-rmap-convert-page-folio-for-hwpoison-checks.patch mm-rmap-add-try_to_unmap_poisoned_hugetlb_one.patch mm-rmap-refactor-some-code-around-lazyfree-folio-unmapping.patch mm-rmap-refactor-anon-folio-unmap-in-try_to_unmap_one.patch mm-rmap-add-anon-folio-unmap-dispatcher.patch mm-memory-move-pte_install_uffd_wp_if_needed-into-memoryc.patch mm-memory-batch-set-uffd-wp-markers-during-zapping.patch mm-rmap-batch-unmap-file-folios-belonging-to-uffd-wp-vmas.patch