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 36E061862 for ; Sat, 18 Jul 2026 01:10:44 +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=1784337046; cv=none; b=qTknrJYN7zA/8BEAgwdJ7vz9B/gZP18FbryIaBvuvAuDV+9kb0PYo8pjIfWLW7c6NPch46kNlnoIslyLVG3UtxrkV1g4FnDfxiiL2gNtIjX1CQ5GOTpGmk/Ks3HnxvCCC+wsSWa9Gi2auPa0npZrFlDAcyRPC5UWIC0mVXCpdmY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784337046; c=relaxed/simple; bh=CHAaReYp+Wz7BCYT7OECQbuyR/7wGJx4TSv6xM7nyyA=; h=Date:To:From:Subject:Message-Id; b=rsSv5X48vgk4G1rW/oOxwAA4fJ4dJCfrBp4xDT8n1k0+Oq8eQtlD1uFRYEcWAQze8664797WgmFNR+F4a8A5Dz2Wwrg9c8R/xwYBMdhBVGyL22jxHXHz7WUkhTKtgC9Nz3fgzigcbfA32eqjfJeQ+hbl1rmKpJKPAoPoU1vD5Sk= 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=hfVvejGU; 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="hfVvejGU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B07B01F00A3A; Sat, 18 Jul 2026 01:10:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1784337044; bh=Re3BK1LQ+NCJB3jY4ae0MiWhIA5RGpwXQfaBMf1aJCs=; h=Date:To:From:Subject; b=hfVvejGUgHxsqZlO98ZWI4c0dm2iQ+cfgmsg2go8FaFZLJ8yQ1tgBm/HIHDXBbUWw /iKD9JC/FQKSvMcPQ2Ho8JDgmrcSLKCivWX/C66rqai3wK7Z2wLINXfi5Xiiyu0HFT I8nr6dfjOnv4IdPUv0J4Vydvg8Fqk5CAr3PKluUc= Date: Fri, 17 Jul 2026 18:10:44 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,vbabka@kernel.org,pfalcato@suse.de,ljs@kernel.org,liam@infradead.org,jannh@google.com,david@kernel.org,wangkefeng.wang@huawei.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-mincore-remove-special-handling-for-vm_pfnmap.patch added to mm-new branch Message-Id: <20260718011044.B07B01F00A3A@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: mincore: remove special handling for VM_PFNMAP has been added to the -mm mm-new branch. Its filename is mm-mincore-remove-special-handling-for-vm_pfnmap.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mincore-remove-special-handling-for-vm_pfnmap.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Kefeng Wang Subject: mm: mincore: remove special handling for VM_PFNMAP Date: Fri, 17 Jul 2026 17:13:43 +0800 As David pointed out, "it's hard to believe that someone depends on pages in VM_PFNMAP to *not* be present", so remove the historical behavior that always reports VM_PFNMAP pages as non-resident. Adding mincore_pud_range() allows the page table walker to traverse the full page table hierarchy without splitting a huge PUD, enabling much more precise identification of resident pages in PFNMAP VMAs. Link: https://lore.kernel.org/linux-mm/0e619d71-1c3d-4534-8376-2982c7348c31@kernel.org/ Link: https://lore.kernel.org/20260717091347.1144789-3-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Suggested-by: David Hildenbrand (Arm) Cc: Jann Horn Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Pedro Falcato Cc: Vlastimil Babka Cc: Zi Yan Signed-off-by: Andrew Morton --- mm/mincore.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) --- a/mm/mincore.c~mm-mincore-remove-special-handling-for-vm_pfnmap +++ a/mm/mincore.c @@ -160,6 +160,21 @@ static int mincore_unmapped_range(unsign return 0; } +static int mincore_pud_range(pud_t *pudp, unsigned long addr, unsigned long end, + struct mm_walk *walk) +{ + if (pud_is_huge(pudp_get(pudp))) { + int nr = (end - addr) >> PAGE_SHIFT; + unsigned char *vec = walk->private; + + memset(vec, 1, nr); + walk->action = ACTION_CONTINUE; + walk->private += nr; + } + + return 0; +} + static int mincore_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk) { @@ -232,6 +247,7 @@ static inline bool can_do_mincore(struct } static const struct mm_walk_ops mincore_walk_ops = { + .pud_entry = mincore_pud_range, .pmd_entry = mincore_pte_range, .pte_hole = mincore_unmapped_range, .hugetlb_entry = mincore_hugetlb, @@ -259,14 +275,6 @@ static long do_mincore(unsigned long add return pages; } - /* - * mincore historically reports PFNMAP mappings as non-resident. - */ - if (vma->vm_flags & VM_PFNMAP) { - __mincore_unmapped_range(addr, end, vma, vec); - return (end - addr) >> PAGE_SHIFT; - } - err = walk_page_range_vma(vma, addr, end, &mincore_walk_ops, vec); if (err < 0) return err; _ Patches currently in -mm which might be from wangkefeng.wang@huawei.com are mm-migrate_device-fix-pte_pfn-pte_dirty-called-on-non-present-pte.patch mm-remove-pagetranscompound.patch mm-mincore-use-walk_page_range_vma-in-do_mincore.patch mm-mprotect-use-walk_page_range_vma-in-mprotect_fixup.patch mm-mlock-use-walk_page_range_vma-in-mlock_vma_pages_range.patch mm-migrate_device-use-walk_page_range_vma-in-migrate_vma_collect.patch mm-introduce-pud_is_huge-helper.patch mm-mincore-remove-special-handling-for-vm_pfnmap.patch mm-mincore-replace-__get_free_page-with-kmalloc.patch mm-mincore-remove-xa_is_value-in-mincore_swap.patch mm-mincore-improve-mincore_hugetlb.patch mm-mincore-refactor-mincore_page.patch