+ mm-introduce-and-use-linear_page_delta.patch added to mm-new branch

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

The patch titled
     Subject: mm: introduce and use linear_page_delta()
has been added to the -mm mm-new branch.  Its filename is
     mm-introduce-and-use-linear_page_delta.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-introduce-and-use-linear_page_delta.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 <ljs@kernel.org>
Subject: mm: introduce and use linear_page_delta()
Date: Fri, 10 Jul 2026 21:16:58 +0100

It's often useful to obtain the number of pages a given address lies at
within a VMA.

Add linear_page_delta() to determine this and update linear_page_index() to
make use of it.

Add comments to describe both linear_page_delta() and linear_page_index().

We refer the reader to the comment for vma_start_pgoff() so we don't
duplicate information about the meaning of a VMA's page offset, which is
also less likely to result in bitrot.

No functional change intended.

Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-17-2a5aa403d977@kernel.org
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
Reviewed-by: Ackerley Tng <ackerleytng@google.com>
Reviewed-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Kai Huang <kai.huang@intel.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: SJ Park <sj@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/pagemap.h |   33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

--- a/include/linux/pagemap.h~mm-introduce-and-use-linear_page_delta
+++ a/include/linux/pagemap.h
@@ -1063,11 +1063,40 @@ static inline pgoff_t folio_pgoff(const
 	return folio->index;
 }
 
+/**
+ * linear_page_delta() - Determine the relative page offset of @address within
+ * @vma.
+ * @vma: The VMA in which @address resides.
+ * @address: The address whose relative page offset is required.
+ *
+ * The result is identical for both file-backed and anonymous mappings and
+ * simply determines how many pages @address lies from @vma->vm_start.
+ *
+ * Returns: The number of pages @address is offset by within @vma.
+ */
+static inline pgoff_t linear_page_delta(const struct vm_area_struct *vma,
+					const unsigned long address)
+{
+	return (address - vma->vm_start) >> PAGE_SHIFT;
+}
+
+/**
+ * linear_page_index() - Determine the absolute page offset of @address within
+ * @vma.
+ * @vma: The VMA in which @address resides.
+ * @address: The address whose absolute page offset is required.
+ *
+ * See the comment for vma_start_pgoff() for a description of what the page
+ * offset signifies.
+ *
+ * Returns: The absolute page offset of @address within @vma.
+ */
 static inline pgoff_t linear_page_index(const struct vm_area_struct *vma,
 					const unsigned long address)
 {
 	pgoff_t pgoff;
-	pgoff = (address - vma->vm_start) >> PAGE_SHIFT;
+
+	pgoff = linear_page_delta(vma, address);
 	pgoff += vma->vm_pgoff;
 	return pgoff;
 }
@@ -1219,7 +1248,7 @@ static inline vm_fault_t folio_lock_or_r
 void folio_wait_bit(struct folio *folio, int bit_nr);
 int folio_wait_bit_killable(struct folio *folio, int bit_nr);
 
-/* 
+/*
  * Wait for a folio to be unlocked.
  *
  * This must be called with the caller "holding" the folio,
_

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