+ hsi-cmt_speech-convert-mmap-hook-to-mmap_prepare-refactor.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: HSI: cmt_speech: convert mmap hook to mmap_prepare, refactor
has been added to the -mm mm-new branch.  Its filename is
     hsi-cmt_speech-convert-mmap-hook-to-mmap_prepare-refactor.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/hsi-cmt_speech-convert-mmap-hook-to-mmap_prepare-refactor.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

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------------------------------------------------------
From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Subject: HSI: cmt_speech: convert mmap hook to mmap_prepare, refactor
Date: Mon, 14 Sep 2026 15:57:40 +0100

Use the mmap_prepare in favour of the deprecated mmap hook as part of the
work to convert one to another.

Since this is simply a refcounted kernel page that has been allocated, it
should not be marked VM_IO and should be inserted using the kernel page
insertion mechanism, so convert it to do this instead.

Use the VMA descriptor's private data field as a scratch buffer to store
the page in - this stays valid throughout the kernel page mapping
operation.

Link: https://lore.kernel.org/20260914-b4-mmap-prepare-vma-flag-sanify-v2-20-7d9781ed5361@kernel.org
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/hsi/clients/cmt_speech.c |   33 +++++++----------------------
 1 file changed, 9 insertions(+), 24 deletions(-)

--- a/drivers/hsi/clients/cmt_speech.c~hsi-cmt_speech-convert-mmap-hook-to-mmap_prepare-refactor
+++ a/drivers/hsi/clients/cmt_speech.c
@@ -1084,22 +1084,6 @@ static void cs_hsi_stop(struct cs_hsi_if
 	kfree(hi);
 }
 
-static vm_fault_t cs_char_vma_fault(struct vm_fault *vmf)
-{
-	struct cs_char *csdata = vmf->vma->vm_private_data;
-	struct page *page;
-
-	page = virt_to_page((void *)csdata->mmap_base);
-	get_page(page);
-	vmf->page = page;
-
-	return 0;
-}
-
-static const struct vm_operations_struct cs_char_vm_ops = {
-	.fault	= cs_char_vma_fault,
-};
-
 static int cs_char_fasync(int fd, struct file *file, int on)
 {
 	struct cs_char *csdata = file->private_data;
@@ -1256,18 +1240,19 @@ static long cs_char_ioctl(struct file *f
 	return r;
 }
 
-static int cs_char_mmap(struct file *file, struct vm_area_struct *vma)
+static int cs_char_mmap_prepare(struct vm_area_desc *desc)
 {
-	if (vma->vm_end < vma->vm_start)
-		return -EINVAL;
+	struct file *file = desc->file;
+	struct cs_char *csdata = file->private_data;
+	struct page **pages = (struct page **)&desc->private_data;
 
-	if (vma_pages(vma) != 1)
+	if (vma_desc_pages(desc) != 1)
 		return -EINVAL;
 
-	vm_flags_set(vma, VM_IO | VM_DONTDUMP | VM_DONTEXPAND);
-	vma->vm_ops = &cs_char_vm_ops;
-	vma->vm_private_data = file->private_data;
+	vma_desc_set_flags(desc, VMA_DONTDUMP_BIT, VMA_DONTEXPAND_BIT);
 
+	*pages = virt_to_page((void *)csdata->mmap_base);
+	mmap_action_map_kernel_pages_full(desc, pages);
 	return 0;
 }
 
@@ -1353,7 +1338,7 @@ static const struct file_operations cs_c
 	.write		= cs_char_write,
 	.poll		= cs_char_poll,
 	.unlocked_ioctl	= cs_char_ioctl,
-	.mmap		= cs_char_mmap,
+	.mmap_prepare	= cs_char_mmap_prepare,
 	.open		= cs_char_open,
 	.release	= cs_char_release,
 	.fasync		= cs_char_fasync,
_

Patches currently in -mm which might be from ljs@kernel.org are

mm-vmpressure-remove-window-size-todo.patch
tools-testing-selftests-mm-add-missing-gitignore-entries.patch
mm-move-drivers-char-memc-to-mm-char-memc.patch
mm-implement-file_is_dev_zero-to-uniquely-identify-dev-zero.patch
mm-vma-only-permit-map_private-dev-zero-to-be-mapped-anonymous.patch
mm-vma-make-map_private-mapped-dev-zero-mappings-truly-anonymous.patch
tools-testing-vma-add-test-to-assert-map_private-dev-zero-is-anon.patch
tools-testing-selftests-mm-add-map_private-dev-zero-merge-tests.patch
mm-madvise-swap-in-cowd-map_private-file-mappings-on-madv_willneed.patch
mm-huge_memory-zap-deposited-page-tables-after-an-rcu-grace-period.patch
mm-enable-mmu_gather_rcu_table_free-for-most-2-level-architectures.patch
mm-enable-mmu_gather_rcu_table_free-for-mmu-riscv.patch
mm-enable-mmu_gather_rcu_table_free-for-mmu-arm.patch
mm-enable-mmu_gather_rcu_table_free-for-arc-microblaze-xtensa.patch
mm-enable-mmu_gather_rcu_table_free-for-sparc64.patch
mm-enable-mmu_gather_rcu_table_free-for-m68k-coldfire.patch
mm-enable-mmu_gather_rcu_table_free-for-sh-x2.patch
mm-enable-mmu_gather_rcu_table_free-for-m68k-motorola.patch
mm-enable-mmu_gather_rcu_table_free-for-sparc32.patch
mm-make-userland-page-table-freeing-rcu-safe.patch
mm-change-the-contract-for-free_pgtables-update-docs.patch
mm-vma-fix-mmap_prepare-file-handling-remove-file_doesnt_need_get.patch
mm-vma-predicate-setting-mmap_prepare-vma-fields-on-new-vma-alloc.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_kernel_owned-predicates.patch
mm-vma-only-allow-mmap-to-clear-vma_maywrite_bit-if-kernel-owned.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-only-kernel-owned-mappings-may-set-vma_io_bit.patch
mm-remove-vma_io_bit-check-in-vma_is_kernel_owned.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_persistent.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-introduce-and-use-vma_can_gup.patch