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 3201A407569 for ; Fri, 10 Jul 2026 22:47:12 +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=1783723633; cv=none; b=TUmPVX1XAC2Fn9AtiE4XF9SWzoOpj5+RsQ8MScfXT7TAgCD/71NDxJCV9KhQcgptT7WYu514kiF642HY3ZtAKIM1omlau/D0Z0z6xzc66WUcMnb3VJUbgNRrHbmPRMk7zXjKIZl56wIFueqPmpaL0u3DxR9wkfhKgSyT06xgWkw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783723633; c=relaxed/simple; bh=LRZ83OYcGfzEy9ocSZBLW3jbr+dUHB84lTLI/lE5+BI=; h=Date:To:From:Subject:Message-Id; b=ptxgf0/zWwW1uDLbTd2j0pqpRSOZeTcQoYeBuN19krCdlowB/VgwgzzYxzSdGJt/lxSw7QaOkmyNEnSTDhcee0TK20Sw2U8DPXcQiMBjcrTWTLp33YbNy6iLRanz5H7u6+BgRZrnTyl9n4Eg344KjxV8puz7OFT8h8UCCROJwxo= 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=oAwaexfC; 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="oAwaexfC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 069851F000E9; Fri, 10 Jul 2026 22:47:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1783723632; bh=5AUotlXrzvH54kzYY8BCJkIY8fvBzBZvDJzyRqkaMG0=; h=Date:To:From:Subject; b=oAwaexfCud3MP+GDCZijsWdzZaO62xD0AdZzt7VlBWFRaykMsgkJDAJzaTd6TVWWs pVqxkTf0oAJrFKEZ8g54jU+46XUYIic2Q+JbTSgK8dfNbZHeFGvx67xAlmsjfm4LrR YoY9uYWM6GUTnABNA7SMsSaDlUQF/X5VPSI5mmaU= Date: Fri, 10 Jul 2026 15:47:11 -0700 To: mm-commits@vger.kernel.org,ljs@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-vma-move-__install_special_mapping-to-vmac.patch added to mm-new branch Message-Id: <20260710224712.069851F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/vma: move __install_special_mapping() to vma.c has been added to the -mm mm-new branch. Its filename is mm-vma-move-__install_special_mapping-to-vmac.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vma-move-__install_special_mapping-to-vmac.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: Lorenzo Stoakes Subject: mm/vma: move __install_special_mapping() to vma.c Date: Fri, 10 Jul 2026 21:17:05 +0100 This function is operating on VMAs and rightly belongs in vma.c, where it can be subject to VMA userland testing and allows us to isolate it from the rest of mm. The _install_special_mapping() function will remain in mmap.c as a wrapper, since this is used by architecture-specific code. Doing so allows us to isolate more functions in vma.c for the same reasons. This forms part of work to allow for tracking MAP_PRIVATE file-backed mappings by their anonymous virtual page offset, as doing so allows us to isolate and keep code that interacts with this together. No functional change intended. Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-24-2a5aa403d977@kernel.org Signed-off-by: Lorenzo Stoakes Reviewed-by: Pedro Falcato Reviewed-by: Gregory Price Cc: Ackerley Tng Cc: David Hildenbrand (Arm) Cc: Kai Huang Cc: Marek Szyprowski Cc: SJ Park Cc: Thomas Zimmermann Cc: Vlastimil Babka (SUSE) Signed-off-by: Andrew Morton --- mm/mmap.c | 38 -------------------------------------- mm/vma.c | 38 ++++++++++++++++++++++++++++++++++++++ mm/vma.h | 5 +++++ 3 files changed, 43 insertions(+), 38 deletions(-) --- a/mm/mmap.c~mm-vma-move-__install_special_mapping-to-vmac +++ a/mm/mmap.c @@ -1447,44 +1447,6 @@ static vm_fault_t special_mapping_fault( return VM_FAULT_SIGBUS; } -static struct vm_area_struct *__install_special_mapping( - struct mm_struct *mm, - unsigned long addr, unsigned long len, - vm_flags_t vm_flags, void *priv, - const struct vm_operations_struct *ops) -{ - int ret; - struct vm_area_struct *vma; - - vma = vm_area_alloc(mm); - if (unlikely(vma == NULL)) - return ERR_PTR(-ENOMEM); - - vma_set_range(vma, addr, addr + len, 0); - vm_flags |= mm->def_flags | VM_DONTEXPAND; - if (pgtable_supports_soft_dirty()) - vm_flags |= VM_SOFTDIRTY; - vm_flags_init(vma, vm_flags & ~VM_LOCKED_MASK); - vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); - - vma->vm_ops = ops; - vma->vm_private_data = priv; - - ret = insert_vm_struct(mm, vma); - if (ret) - goto out; - - vm_stat_account(mm, vma->vm_flags, len >> PAGE_SHIFT); - - perf_event_mmap(vma); - - return vma; - -out: - vm_area_free(vma); - return ERR_PTR(ret); -} - bool vma_is_special_mapping(const struct vm_area_struct *vma, const struct vm_special_mapping *sm) { --- a/mm/vma.c~mm-vma-move-__install_special_mapping-to-vmac +++ a/mm/vma.c @@ -3399,3 +3399,41 @@ __weak unsigned long vma_mmu_pagesize(st { return vma_kernel_pagesize(vma); } + +struct vm_area_struct *__install_special_mapping( + struct mm_struct *mm, + unsigned long addr, unsigned long len, + vm_flags_t vm_flags, void *priv, + const struct vm_operations_struct *ops) +{ + int ret; + struct vm_area_struct *vma; + + vma = vm_area_alloc(mm); + if (unlikely(vma == NULL)) + return ERR_PTR(-ENOMEM); + + vma_set_range(vma, addr, addr + len, 0); + vm_flags |= mm->def_flags | VM_DONTEXPAND; + if (pgtable_supports_soft_dirty()) + vm_flags |= VM_SOFTDIRTY; + vm_flags_init(vma, vm_flags & ~VM_LOCKED_MASK); + vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); + + vma->vm_ops = ops; + vma->vm_private_data = priv; + + ret = insert_vm_struct(mm, vma); + if (ret) + goto out; + + vm_stat_account(mm, vma->vm_flags, len >> PAGE_SHIFT); + + perf_event_mmap(vma); + + return vma; + +out: + vm_area_free(vma); + return ERR_PTR(ret); +} --- a/mm/vma.h~mm-vma-move-__install_special_mapping-to-vmac +++ a/mm/vma.h @@ -775,4 +775,9 @@ static inline bool map_deny_write_exec(c } #endif +struct vm_area_struct *__install_special_mapping(struct mm_struct *mm, + unsigned long addr, unsigned long len, + vm_flags_t vm_flags, void *priv, + const struct vm_operations_struct *ops); + #endif /* __MM_VMA_H */ _ Patches currently in -mm which might be from ljs@kernel.org are mm-move-alloc-tag-to-mm.patch mm-ptdump-always-stabilise-against-page-table-freeing-using-init_mm.patch mm-vmalloc-acquire-init_mm-read-lock-on-huge-vmap-promotion.patch revert-arm64-enable-vmalloc-huge-with-ptdump.patch mm-move-vma_start_pgoff-into-mmh-and-clean-up.patch mm-add-kdoc-comments-for-vma_start-last_pgoff.patch tools-testing-vma-use-vma_start_pgoff-in-merge-tests.patch mm-introduce-and-use-vma_end_pgoff.patch mm-rmap-update-mm-interval_treec-comments.patch mm-rmap-parameterise-vma_interval_tree_-by-address_space.patch mm-rmap-elide-unnecessary-static-inlines-in-interval_treec.patch mm-rmap-rename-vma_interval_tree_-to-mapping_rmap_tree_.patch mm-rmap-parameterise-anon_vma_interval_tree_-by-anon_vma.patch mm-rmap-rename-anon_vma_interval_tree_-params-and-use-pgoff_t.patch mm-rmap-rename-anon_vma_interval_tree_-to-anon_rmap_tree_.patch maintainers-move-mm-interval_treec-to-rmap-section.patch mm-vma-introduce-and-use-vmg_pages-vmg__pgoff.patch mm-vma-clean-up-anon_vma_compatible.patch mm-vma-refactor-vmg_adjust_set_range-for-clarity.patch mm-vma-minor-cleanup-of-expand_.patch mm-introduce-and-use-linear_page_delta.patch mm-vma-use-vma_start_pgoff-linear_page_index-in-mm-code.patch mm-prefer-vma__pgoff-to-vma-vm_pgoff-in-kernel.patch mm-vma-remove-duplicative-vma_pgoff_offset-helper.patch mm-use-linear_page_-consistently.patch mm-vma-introduce-vma_assert_can_modify.patch mm-vma-add-and-use-vma__pgoff.patch mm-vma-move-__install_special_mapping-to-vmac.patch mm-vma-make-vma_set_range-static-drop-insert_vm_struct-decl.patch mm-vma-update-vma_shrink-to-not-pass-start-pgoff-parameters.patch mm-vma-update-vmg_adjust_set_range-to-offset-pgoff-instead.patch mm-vma-slightly-rework-the-anonymous-check-in-__mmap_new_vma.patch mm-vma-introduce-and-use-vma_set_pgoff.patch mm-vma-correct-incorrect-vmah-inclusion.patch mm-vma-use-guard-clauses-in-can_vma_merge_.patch tools-testing-vma-default-vma-mm-flag-bits-to-64-bit.patch tools-testing-vma-output-compared-expression-on-assert_.patch