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 E75D3370AE0 for ; Sat, 10 Oct 2026 22:01:46 +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=1791669708; cv=none; b=ofbwbkjHX7e2HH7dRU34WeJ+fWLTjFhs0EZacOnv4eGjlQpObWuM7R8szliA8zM01TMVI+u6ZKGrqEyMKBa5GYprQEA2gh8f2mSODc4SLYk7PAlyt7CTn6vceEFWqZym6UB6eFQDrwsM8y3q2OCfFyzLyqDGHvL6YIvrD1qz5go= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791669708; c=relaxed/simple; bh=ED6x3behQpXVmmaYcpcaYGmBexUUJE553Uz+kcrbpA8=; h=Date:To:From:Subject:Message-Id; b=CPiO5v9vPRHJXmR6K2VE+JXIyBJ2BqQTPxN6H5mAooTsn0uyFGbq19rhrPtgSGSxX6EUBHK9mLsXiwhm254Sjs77S3CXpMxVoXG7yzWlnc3qDoIYbioEpFusg4WkHtBWjfX1GWLxGq0rMy6PNsV7ILlsDV8VuLE7I7Sk3reIXAA= 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=kJ+aZM6j; 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="kJ+aZM6j" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79D281F000FF; Sat, 10 Oct 2026 22:01:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791669706; bh=S1Q1kJJBrbCJsGQ8R1GhES/Nyl0NtAn1gqorrCxK9SM=; h=Date:To:From:Subject; b=kJ+aZM6jdn7hmHlamB4nWpnolF5m+S8UDa5AszFZHXIRnkhSSJv/cToBwWl+TsPbt 2eNia6N2M5iDFNvl6OEXXglD/q9HHKc/Dw+hUJg/XzX1it87ZsKcFOimiMVe0WYw9Q Mm74N8/zew32pGHHbDLL9dbRdEKNUkpu2YG8TETI= Date: Sat, 10 Oct 2026 15:01:46 -0700 To: mm-commits@vger.kernel.org,ljs@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-add-mmap-action-for-discontiguous-kernel-page-mapping.patch added to mm-unstable branch Message-Id: <20261010220146.79D281F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: add mmap action for discontiguous kernel page mapping has been added to the -mm mm-unstable branch. Its filename is mm-add-mmap-action-for-discontiguous-kernel-page-mapping.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-add-mmap-action-for-discontiguous-kernel-page-mapping.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm 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 (ARM)" Subject: mm: add mmap action for discontiguous kernel page mapping Date: Fri, 09 Oct 2026 19:04:01 +0100 The existing kernel page mapping mmap actions allow for partial and full mapping of an array of struct page pointers. However some drivers require the mapping of discontiguous ranges. Permit this by providing discontig_kernel_page_ops which allows a driver to specify how the operation should begin and how batches of pages should be retrieved. It uses the minimum exposed interface to do so, providing address, page offset and both vm_private_data state and a local private state object. ops->init can establish state for the operation, and ops->get outputs the pages to map and their count. Should an error arise the core unmaps the VMA, invoking vm_ops->close, which is therefore where any state established by ops->init is released. Also update the compatibility layer to do this too via compat_mmap_action_abort(). Batches may not exceed the VMA, but may map less than its full range in case the driver wishes to allow the user to map an area larger than the available data. To use it, users invoke mmap_action_map_discontig_kernel_pages() with initial local private state and a set of operations. Users can then use one of the provided helper functions to perform an action: * discontig_kernel_map_abort() - Abort and leave the mapping as it has been accumulated so far. * discontig_kernel_map_page() - Map a single page, or a compound page given its head page. * discontig_kernel_map_page_range() - Maps a struct page ** array of a specified count, mapping only those pages which fit in the VMA. While here, update vm_insert_page() and vm_insert_pages() to assert the mmap write lock is held rather than the bizarre assert !mmap_read_trylock() and use the new VMA API so all code paths are consistent. Also convert a BUG_ON() to a VM_WARN_ON_ONCE() in vm_insert_page(). The userland VMA tests are updated accordingly. Link: https://lore.kernel.org/20261009-b4-mmap-prepare-vma-flag-sanify-v5-7-923b70125b1e@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) Signed-off-by: Andrew Morton Acked-by: Zi Yan Cc: Liam R. Howlett Cc: Vlastimil Babka Cc: Jann Horn Cc: Pedro Falcato Cc: David Hildenbrand Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Jonathan Corbet Cc: Greg Kroah-Hartman Cc: Dennis Dalessandro Cc: Jason Gunthorpe Cc: Leon Romanovsky Cc: Paul Moore Cc: Stephen Smalley Cc: Jaroslav Kysela Cc: Takashi Iwai Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Andrii Nakryiko Cc: Eduard Zingerman Cc: Kumar Kartikeya Dwivedi Cc: Baolin Wang Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Barry Song Cc: Lance Yang Cc: Usama Arif Cc: Kiryl Shutsemau Cc: Doug Gilbert Cc: James Bottomley Cc: Martin K. Petersen Cc: Simona Vetter Cc: Helge Deller Cc: Sebastian Reichel Cc: John Hubbard Cc: Peter Xu Cc: Masami Hiramatsu Cc: Oleg Nesterov Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: Arnaldo Carvalho de Melo Cc: Namhyung Kim Cc: Mark Rutland Cc: Rik van Riel Cc: Harry Yoo Cc: Juri Lelli Cc: Vincent Guittot Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thomas Zimmermann Cc: David Airlie Cc: Will Deacon Cc: Aneesh Kumar K.V Cc: Nicholas Piggin Cc: Arnd Bergmann Cc: Muchun Song Cc: Oscar Salvador Cc: Matthew Wilcox (Oracle) Cc: Jan Kara Cc: Marc Zyngier Cc: Oliver Upton Cc: Catalin Marinas Cc: Madhavan Srinivasan Cc: Anup Patel Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Christian Borntraeger Cc: Janosch Frank Cc: Claudio Imbrenda Cc: Alexander Gordeev Cc: Gerald Schaefer Cc: Heiko Carstens Cc: Vasily Gorbik Cc: David S. Miller Cc: Andreas Larsson Cc: Al Viro Cc: Christian Brauner Cc: Matthew Brost Cc: Joshua Hahn Cc: Rakie Kim Cc: Byungchul Park Cc: Gregory Price Cc: Ying Huang Cc: Alistair Popple Cc: Chris Li Cc: Kairui Song Cc: Kemeng Shi Cc: Nhat Pham Cc: Baoquan He Cc: Youngjun Park Cc: Johannes Weiner Cc: Qi Zheng Cc: Shakeel Butt Cc: Axel Rasmussen Cc: Yuanchu Xie Cc: Wei Xu Cc: Chengming Zhou Cc: Michal Hocko Cc: Miklos Szeredi Cc: Xu Xin Cc: Ihor Solodrai Cc: Bert Karwatzki --- include/linux/mm.h | 45 ++++++++++ include/linux/mm_types.h | 44 ++++++++++ mm/internal.h | 3 mm/memory.c | 126 ++++++++++++++++++++++++++---- mm/util.c | 27 +++++- tools/testing/vma/include/dup.h | 11 ++ 6 files changed, 234 insertions(+), 22 deletions(-) --- a/include/linux/mm.h~mm-add-mmap-action-for-discontiguous-kernel-page-mapping +++ a/include/linux/mm.h @@ -4654,10 +4654,55 @@ static inline void mmap_action_map_kerne vma_desc_pages(desc)); } +static inline +void mmap_action_map_discontig_kernel_pages(struct vm_area_desc *desc, + void *init_private, const struct discontig_kernel_page_ops *ops) +{ + struct mmap_action *action = &desc->action; + + action->type = MMAP_DISCONTIG_KERNEL_PAGES; + action->map_kernel_discontig.init_private = init_private; + action->map_kernel_discontig.ops = ops; +} + int mmap_action_prepare(struct vm_area_desc *desc); int mmap_action_complete(struct vm_area_struct *vma, struct mmap_action *action, bool is_compat); +static inline void +discontig_kernel_map_abort(struct discontig_kernel_page_state *state) +{ + state->action = DISCONTIG_KERNEL_PAGE_ABORT; +} + +static inline void +discontig_kernel_map_page(struct discontig_kernel_page_state *state, + struct page *page) +{ + struct folio *folio = page_folio(page); + + if (folio_test_large(folio)) { + VM_WARN_ON_ONCE(page != folio_page(folio, 0)); + state->action = DISCONTIG_KERNEL_PAGE_MAP_COMPOUND_PAGE; + state->__folio = folio; + state->__nr_pages = min(state->nr_pages_remain, + folio_nr_pages(folio)); + } else { + state->action = DISCONTIG_KERNEL_PAGE_MAP_PAGE; + state->__page = page; + state->__nr_pages = 1; + } +} + +static inline void +discontig_kernel_map_page_range(struct discontig_kernel_page_state *state, + struct page **page_arr, unsigned long nr_pages) +{ + state->action = DISCONTIG_KERNEL_PAGE_MAP_PAGE_RANGE; + state->__page_arr = page_arr; + state->__nr_pages = min(nr_pages, state->nr_pages_remain); +} + /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, unsigned long vm_start, unsigned long vm_end) --- a/include/linux/mm_types.h~mm-add-mmap-action-for-discontiguous-kernel-page-mapping +++ a/include/linux/mm_types.h @@ -818,8 +818,44 @@ enum mmap_action_type { MMAP_NOTHING, MMAP_REMAP_PFN, MMAP_IO_REMAP_PFN, - MMAP_SIMPLE_IO_REMAP, /* I/O remap with guardrails. */ - MMAP_KERNEL_PAGES, /* Map kernel page range from array. */ + MMAP_SIMPLE_IO_REMAP, /* I/O remap with guardrails. */ + MMAP_KERNEL_PAGES, /* Map kernel page range from array. */ + MMAP_DISCONTIG_KERNEL_PAGES, /* Map kernel discontig page range. */ +}; + +enum discontig_kernel_page_action { + DISCONTIG_KERNEL_PAGE_ABORT, + DISCONTIG_KERNEL_PAGE_MAP_PAGE, + DISCONTIG_KERNEL_PAGE_MAP_COMPOUND_PAGE, + DISCONTIG_KERNEL_PAGE_MAP_PAGE_RANGE, +}; + +struct discontig_kernel_page_state { + /* Map state. */ + const unsigned long start; /* Start address of VMA. */ + const unsigned long end; /* End address of VMA. */ + unsigned long addr; /* The current address to be mapped. */ + pgoff_t pgoff; /* The current pgoff to be mapped. */ + unsigned long nr_pages_mapped; /* The number of pages mapped. */ + unsigned long nr_pages_remain; /* The number of pages remaining. */ + + /* User-defined state. */ + void *vm_private_data; /* VMA private data. */ + void *private; /* Mapping private data. */ + + /* Users should not touch these, use discontig_kernel_map_*() helpers. */ + enum discontig_kernel_page_action action; + union { + struct page *__page; + struct folio *__folio; + struct page **__page_arr; + }; + unsigned long __nr_pages; +}; + +struct discontig_kernel_page_ops { + int (*init)(void *vm_private_data, void **private); + int (*get)(struct discontig_kernel_page_state *state); }; /* @@ -844,6 +880,10 @@ struct mmap_action { unsigned long nr_pages; pgoff_t pgoff; } map_kernel; + struct { + void *init_private; + const struct discontig_kernel_page_ops *ops; + } map_kernel_discontig; }; enum mmap_action_type type; --- a/mm/internal.h~mm-add-mmap-action-for-discontiguous-kernel-page-mapping +++ a/mm/internal.h @@ -1517,6 +1517,9 @@ int simple_ioremap_prepare(struct vm_are int map_kernel_pages_prepare(struct vm_area_desc *desc); int map_kernel_pages_complete(struct vm_area_struct *vma, struct mmap_action *action); +int map_discontig_kernel_pages_prepare(struct vm_area_desc *desc); +int map_discontig_kernel_pages_complete(struct vm_area_struct *vma, + struct mmap_action *action); static inline int io_remap_pfn_range_prepare(struct vm_area_desc *desc) { --- a/mm/memory.c~mm-add-mmap-action-for-discontiguous-kernel-page-mapping +++ a/mm/memory.c @@ -2610,27 +2610,34 @@ int vm_insert_pages(struct vm_area_struc if (!range_in_vma(vma, addr, end)) return -EFAULT; - if (!(vma->vm_flags & VM_MIXEDMAP)) { - VM_WARN_ON_ONCE(mmap_read_trylock(vma->vm_mm)); - VM_WARN_ON_ONCE(vma->vm_flags & VM_PFNMAP); - vm_flags_set(vma, VM_MIXEDMAP); + if (!vma_test(vma, VMA_MIXEDMAP_BIT)) { + mmap_assert_write_locked(vma->vm_mm); + VM_WARN_ON_ONCE(vma_test(vma, VMA_PFNMAP_BIT)); + vma_start_write(vma); + vma_set_flags(vma, VMA_MIXEDMAP_BIT); } /* Defer page refcount checking till we're about to map that page. */ return insert_pages(vma, addr, pages, num, vma->vm_page_prot); } EXPORT_SYMBOL(vm_insert_pages); +static void __map_kernel_pages_prepare(struct vm_area_desc *desc) +{ + if (vma_desc_test(desc, VMA_MIXEDMAP_BIT)) + return; + + mmap_assert_write_locked(desc->mm); + VM_WARN_ON_ONCE(vma_desc_test(desc, VMA_PFNMAP_BIT)); + vma_desc_set_flags(desc, VMA_MIXEDMAP_BIT); +} + int map_kernel_pages_prepare(struct vm_area_desc *desc) { const struct mmap_action *action = &desc->action; const unsigned long addr = action->map_kernel.start; unsigned long nr_pages, end; - if (!vma_desc_test(desc, VMA_MIXEDMAP_BIT)) { - VM_WARN_ON_ONCE(mmap_read_trylock(desc->mm)); - VM_WARN_ON_ONCE(vma_desc_test(desc, VMA_PFNMAP_BIT)); - vma_desc_set_flags(desc, VMA_MIXEDMAP_BIT); - } + __map_kernel_pages_prepare(desc); nr_pages = action->map_kernel.nr_pages; end = addr + PAGE_SIZE * nr_pages; @@ -2651,6 +2658,98 @@ int map_kernel_pages_complete(struct vm_ &nr_pages, vma->vm_page_prot); } +int map_discontig_kernel_pages_prepare(struct vm_area_desc *desc) +{ + const struct mmap_action *action = &desc->action; + const struct discontig_kernel_page_ops *ops = + action->map_kernel_discontig.ops; + + /* At minimum need to be able to get pages. */ + if (WARN_ON_ONCE(!ops || !ops->get)) + return -EINVAL; + + __map_kernel_pages_prepare(desc); + return 0; +} + +static int apply_discontig_action(struct vm_area_struct *vma, + struct discontig_kernel_page_state *state) +{ + unsigned long nr_pages = state->__nr_pages; + unsigned long addr = state->addr; + unsigned long i; + + if (state->action == DISCONTIG_KERNEL_PAGE_MAP_PAGE) + return insert_page(vma, addr, state->__page, + vma->vm_page_prot, /*mkwrite=*/false); + if (state->action == DISCONTIG_KERNEL_PAGE_MAP_PAGE_RANGE) + return insert_pages(vma, addr, state->__page_arr, + &nr_pages, vma->vm_page_prot); + + /* Compound folio - have to iterate through each page. */ + for (i = 0; i < nr_pages; i++, addr += PAGE_SIZE) { + struct page *page = folio_page(state->__folio, i); + int err; + + err = insert_page(vma, addr, page, vma->vm_page_prot, + /*mkwrite=*/false); + if (err) + return err; + } + return 0; +} + +int map_discontig_kernel_pages_complete(struct vm_area_struct *vma, + struct mmap_action *action) +{ + const struct discontig_kernel_page_ops *ops = + action->map_kernel_discontig.ops; + struct discontig_kernel_page_state state = { + .start = vma->vm_start, + .end = vma->vm_end, + .addr = vma->vm_start, + .pgoff = vma->vm_pgoff, + .nr_pages_mapped = 0, + .nr_pages_remain = vma_pages(vma), + .vm_private_data = vma->vm_private_data, + .private = action->map_kernel_discontig.init_private, + }; + int err = 0; + + if (ops->init) + err = ops->init(vma->vm_private_data, &state.private); + if (err) + return err; + + do { + unsigned long end, pgoff_end; + unsigned long nr_pages; + + /* Default to abort. */ + state.action = DISCONTIG_KERNEL_PAGE_ABORT; + err = ops->get(&state); + if (err || state.action == DISCONTIG_KERNEL_PAGE_ABORT) + return err; + nr_pages = state.__nr_pages; + + if (!nr_pages || nr_pages > state.nr_pages_remain) + return -EINVAL; + end = state.addr + PAGE_SIZE * nr_pages; + pgoff_end = state.pgoff + nr_pages; + + err = apply_discontig_action(vma, &state); + if (err) + return err; + + state.addr = end; + state.pgoff = pgoff_end; + state.nr_pages_mapped += nr_pages; + state.nr_pages_remain -= nr_pages; + } while (state.addr < vma->vm_end); + + return 0; +} + /** * vm_insert_page - insert single page into user vma * @vma: user vma to map to @@ -2686,10 +2785,11 @@ int vm_insert_page(struct vm_area_struct { if (addr < vma->vm_start || addr >= vma->vm_end) return -EFAULT; - if (!(vma->vm_flags & VM_MIXEDMAP)) { - BUG_ON(mmap_read_trylock(vma->vm_mm)); - BUG_ON(vma->vm_flags & VM_PFNMAP); - vm_flags_set(vma, VM_MIXEDMAP); + if (!vma_test(vma, VMA_MIXEDMAP_BIT)) { + mmap_assert_write_locked(vma->vm_mm); + VM_WARN_ON_ONCE(vma_test(vma, VMA_PFNMAP_BIT)); + vma_start_write(vma); + vma_set_flags(vma, VMA_MIXEDMAP_BIT); } return insert_page(vma, addr, page, vma->vm_page_prot, false); } --- a/mm/util.c~mm-add-mmap-action-for-discontiguous-kernel-page-mapping +++ a/mm/util.c @@ -1401,6 +1401,15 @@ static int call_vma_mapped(struct vm_are return 0; } +/* An mmap action failed under the compatibility layer - unmap and close. */ +static void compat_mmap_action_abort(struct vm_area_struct *vma) +{ +#ifdef CONFIG_MMU + zap_vma_range(vma, vma->vm_start, vma_pages(vma) << PAGE_SHIFT); +#endif + vma_close(vma); +} + static int mmap_action_finish(struct vm_area_struct *vma, struct mmap_action *action, int err, bool is_compat) @@ -1412,12 +1421,13 @@ static int mmap_action_finish(struct vm_ /* do_munmap() might take rmap lock, so release if held. */ maybe_rmap_unlock_action(vma, action); - /* - * If this is invoked from the compatibility layer, post-mmap() hook - * logic will handle cleanup for us. - */ - if (!err || is_compat) + if (!err) + return 0; + + if (is_compat) { + compat_mmap_action_abort(vma); return err; + } /* * If an error occurs, unmap the VMA altogether and return an error. We @@ -1469,6 +1479,8 @@ int mmap_action_prepare(struct vm_area_d return simple_ioremap_prepare(desc); case MMAP_KERNEL_PAGES: return map_kernel_pages_prepare(desc); + case MMAP_DISCONTIG_KERNEL_PAGES: + return map_discontig_kernel_pages_prepare(desc); } WARN_ON_ONCE(1); @@ -1501,6 +1513,9 @@ int mmap_action_complete(struct vm_area_ case MMAP_KERNEL_PAGES: err = map_kernel_pages_complete(vma, action); break; + case MMAP_DISCONTIG_KERNEL_PAGES: + err = map_discontig_kernel_pages_complete(vma, action); + break; case MMAP_IO_REMAP_PFN: case MMAP_SIMPLE_IO_REMAP: /* Should have been delegated. */ @@ -1522,6 +1537,7 @@ int mmap_action_prepare(struct vm_area_d case MMAP_IO_REMAP_PFN: case MMAP_SIMPLE_IO_REMAP: case MMAP_KERNEL_PAGES: + case MMAP_DISCONTIG_KERNEL_PAGES: WARN_ON_ONCE(1); /* nommu cannot handle these. */ break; } @@ -1543,6 +1559,7 @@ int mmap_action_complete(struct vm_area_ case MMAP_IO_REMAP_PFN: case MMAP_SIMPLE_IO_REMAP: case MMAP_KERNEL_PAGES: + case MMAP_DISCONTIG_KERNEL_PAGES: WARN_ON_ONCE(1); /* nommu cannot handle this. */ err = -EINVAL; --- a/tools/testing/vma/include/dup.h~mm-add-mmap-action-for-discontiguous-kernel-page-mapping +++ a/tools/testing/vma/include/dup.h @@ -457,14 +457,17 @@ enum mmap_action_type { MMAP_NOTHING, MMAP_REMAP_PFN, MMAP_IO_REMAP_PFN, - MMAP_SIMPLE_IO_REMAP, /* I/O remap with guardrails. */ - MMAP_KERNEL_PAGES, /* Map kernel page range from array. */ + MMAP_SIMPLE_IO_REMAP, /* I/O remap with guardrails. */ + MMAP_KERNEL_PAGES, /* Map kernel page range from array. */ + MMAP_DISCONTIG_KERNEL_PAGES, /* Map kernel discontig page range. */ }; /* * Describes an action an mmap_prepare hook can instruct to be taken to complete * the mapping of a VMA. Specified in vm_area_desc. */ +struct discontig_kernel_page_ops; + struct mmap_action { union { struct { @@ -483,6 +486,10 @@ struct mmap_action { unsigned long nr_pages; pgoff_t pgoff; } map_kernel; + struct { + void *init_private; + const struct discontig_kernel_page_ops *ops; + } map_kernel_discontig; }; enum mmap_action_type type; _ Patches currently in -mm which might be from ljs@kernel.org are mm-vma-fix-mmap_prepare-file-handling-remove-file_doesnt_need_get.patch mm-vma-introduce-and-use-vma_can_merge.patch mm-consistently-validate-vma-state-after-mmap-hooks.patch mm-vma-ensure-mmap_prepare-doesnt-set-actions-on-a-mergeable-vma.patch mm-make-map_kernel_pages_-internal-and-unexported.patch mm-vma-tidy-up-map-kernel-pages-enum-values.patch mm-add-mmap-action-for-discontiguous-kernel-page-mapping.patch docs-filesystems-update-mmap_prepare-docs-for-discontig-kernel-pgs.patch drivers-usb-mon-update-to-use-mmap_prepare-map-kernel-pages.patch infiniband-update-hfi1-to-use-remap_vmalloc_range.patch selinux-reject-writable-opens-of-policy-file-drop-mmap-shared-write-check.patch alsa-pcm-use-vm_insert_page-to-map-pcm-status-page.patch bpf-arena-mark-arena_map_mmap-mappings-vm_mixedmap.patch mm-vma-add-vma_is_mm_managed-predicates.patch mm-vma-only-allow-mmap-to-clear-vma_maywrite_bit-if-not-mm-managed.patch mm-vma-add-and-use-vma__is_fixed_mapping.patch scsi-sg-convert-mmap-hook-to-mmap_prepare-and-rework.patch fbdev-defio-assert-fbinfo_virtfb-drop-vm_io-add-vm_mixedmap.patch hsi-cmt_speech-convert-mmap-hook-to-mmap_prepare-refactor.patch mm-gup-error-out-early-on-vma_mayread_bit-vmas.patch uprobes-remove-vm_io-set-vm_mixedmap-for-mapped-kernel-pages.patch mm-mlock-clear-vma_locked_mask-over-mmap-callback.patch mm-mlock-eliminate-weird-vma_io_bit-abuse-and-simplify.patch mm-vma-enforce-that-mm-managed-mappings-may-not-set-vma_io_bit.patch mm-remove-vma_io_bit-check-in-vma_is_mm_managed.patch mm-remove-hugetlb_inlineh.patch mm-rename-is_vm_hugetlb_page-to-vma_is_hugetlb.patch mm-drop-some-redundant-checks-around-hugetlb-vmas.patch mm-madvise-update-is_valid_guard_vma-to-use-vma_can_merge.patch mm-vma-introduce-vma_is_mm_backed.patch mm-uffd-use-predicates-for-userfaultfd-checks.patch mm-madvise-use-predicates-for-madvise-madv_dofork.patch mm-eliminate-vma_special_flags-usage-when-hugetlb-explicitly-tested.patch mm-eliminate-vma_special_flags-check-in-lru_gen_look_around.patch mm-avoid-use-of-vma_special_flags-in-migrate_vma_setup.patch mm-eliminate-vm_special-vma_special_flags.patch fuse-dax-do-not-set-vm_mixedmap.patch mm-huge_memory-remove-vma_is_special_huge.patch mm-vma-const-ify-vma_assert_stabilised-and-associated-functions.patch mm-implement-and-use-vma_has_anon_rmap-silence-kcsan.patch mm-update-comments-to-refer-to-anon-rmap-rather-than-anon_vma.patch mm-vma-dont-remove-vma-from-rmap-if-pgoff-unchanged.patch