+ mm-constify-zone-related-test-getter-functions.patch added to mm-new branch

+ mm-constify-zone-related-test-getter-functions.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm: constify zone related test/getter functions
has been added to the -mm mm-new branch.  Its filename is
     mm-constify-zone-related-test-getter-functions.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-constify-zone-related-test-getter-functions.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.

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 the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Max Kellermann <max.kellermann@ionos.com>
Subject: mm: constify zone related test/getter functions
Date: Mon, 1 Sep 2025 22:50:12 +0200

For improved const-correctness.

We select certain test functions which either invoke each other,
functions that are already const-ified, or no further functions.

It is therefore relatively trivial to const-ify them, which provides a
basis for further const-ification further up the call stack.

Link: https://lkml.kernel.org/r/20250901205021.3573313-4-max.kellermann@ionos.com
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Christian Zankel <chris@zankel.net>
Cc: David Rientjes <rientjes@google.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Bottomley <james.bottomley@HansenPartnership.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Nysal Jan K.A" <nysal@linux.ibm.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russel King <linux@armlinux.org.uk>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Thomas Huth <thuth@redhat.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Wei Xu <weixugc@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/mmzone.h |   42 +++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 21 deletions(-)

--- a/include/linux/mmzone.h~mm-constify-zone-related-test-getter-functions
+++ a/include/linux/mmzone.h
@@ -1104,7 +1104,7 @@ static inline unsigned long promo_wmark_
 	return wmark_pages(z, WMARK_PROMO);
 }
 
-static inline unsigned long zone_managed_pages(struct zone *zone)
+static inline unsigned long zone_managed_pages(const struct zone *zone)
 {
 	return (unsigned long)atomic_long_read(&zone->managed_pages);
 }
@@ -1128,12 +1128,12 @@ static inline bool zone_spans_pfn(const
 	return zone->zone_start_pfn <= pfn && pfn < zone_end_pfn(zone);
 }
 
-static inline bool zone_is_initialized(struct zone *zone)
+static inline bool zone_is_initialized(const struct zone *zone)
 {
 	return zone->initialized;
 }
 
-static inline bool zone_is_empty(struct zone *zone)
+static inline bool zone_is_empty(const struct zone *zone)
 {
 	return zone->spanned_pages == 0;
 }
@@ -1273,7 +1273,7 @@ static inline bool folio_is_zone_movable
  * Return true if [start_pfn, start_pfn + nr_pages) range has a non-empty
  * intersection with the given zone
  */
-static inline bool zone_intersects(struct zone *zone,
+static inline bool zone_intersects(const struct zone *zone,
 		unsigned long start_pfn, unsigned long nr_pages)
 {
 	if (zone_is_empty(zone))
@@ -1581,12 +1581,12 @@ static inline int local_memory_node(int
 #define zone_idx(zone)		((zone) - (zone)->zone_pgdat->node_zones)
 
 #ifdef CONFIG_ZONE_DEVICE
-static inline bool zone_is_zone_device(struct zone *zone)
+static inline bool zone_is_zone_device(const struct zone *zone)
 {
 	return zone_idx(zone) == ZONE_DEVICE;
 }
 #else
-static inline bool zone_is_zone_device(struct zone *zone)
+static inline bool zone_is_zone_device(const struct zone *zone)
 {
 	return false;
 }
@@ -1598,19 +1598,19 @@ static inline bool zone_is_zone_device(s
  * populated_zone(). If the whole zone is reserved then we can easily
  * end up with populated_zone() && !managed_zone().
  */
-static inline bool managed_zone(struct zone *zone)
+static inline bool managed_zone(const struct zone *zone)
 {
 	return zone_managed_pages(zone);
 }
 
 /* Returns true if a zone has memory */
-static inline bool populated_zone(struct zone *zone)
+static inline bool populated_zone(const struct zone *zone)
 {
 	return zone->present_pages;
 }
 
 #ifdef CONFIG_NUMA
-static inline int zone_to_nid(struct zone *zone)
+static inline int zone_to_nid(const struct zone *zone)
 {
 	return zone->node;
 }
@@ -1620,7 +1620,7 @@ static inline void zone_set_nid(struct z
 	zone->node = nid;
 }
 #else
-static inline int zone_to_nid(struct zone *zone)
+static inline int zone_to_nid(const struct zone *zone)
 {
 	return 0;
 }
@@ -1647,7 +1647,7 @@ static inline int is_highmem_idx(enum zo
  * @zone: pointer to struct zone variable
  * Return: 1 for a highmem zone, 0 otherwise
  */
-static inline int is_highmem(struct zone *zone)
+static inline int is_highmem(const struct zone *zone)
 {
 	return is_highmem_idx(zone_idx(zone));
 }
@@ -1713,12 +1713,12 @@ static inline struct zone *zonelist_zone
 	return zoneref->zone;
 }
 
-static inline int zonelist_zone_idx(struct zoneref *zoneref)
+static inline int zonelist_zone_idx(const struct zoneref *zoneref)
 {
 	return zoneref->zone_idx;
 }
 
-static inline int zonelist_node_idx(struct zoneref *zoneref)
+static inline int zonelist_node_idx(const struct zoneref *zoneref)
 {
 	return zone_to_nid(zoneref->zone);
 }
@@ -2021,7 +2021,7 @@ static inline struct page *__section_mem
 	return (struct page *)map;
 }
 
-static inline int present_section(struct mem_section *section)
+static inline int present_section(const struct mem_section *section)
 {
 	return (section && (section->section_mem_map & SECTION_MARKED_PRESENT));
 }
@@ -2031,12 +2031,12 @@ static inline int present_section_nr(uns
 	return present_section(__nr_to_section(nr));
 }
 
-static inline int valid_section(struct mem_section *section)
+static inline int valid_section(const struct mem_section *section)
 {
 	return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP));
 }
 
-static inline int early_section(struct mem_section *section)
+static inline int early_section(const struct mem_section *section)
 {
 	return (section && (section->section_mem_map & SECTION_IS_EARLY));
 }
@@ -2046,27 +2046,27 @@ static inline int valid_section_nr(unsig
 	return valid_section(__nr_to_section(nr));
 }
 
-static inline int online_section(struct mem_section *section)
+static inline int online_section(const struct mem_section *section)
 {
 	return (section && (section->section_mem_map & SECTION_IS_ONLINE));
 }
 
 #ifdef CONFIG_ZONE_DEVICE
-static inline int online_device_section(struct mem_section *section)
+static inline int online_device_section(const struct mem_section *section)
 {
 	unsigned long flags = SECTION_IS_ONLINE | SECTION_TAINT_ZONE_DEVICE;
 
 	return section && ((section->section_mem_map & flags) == flags);
 }
 #else
-static inline int online_device_section(struct mem_section *section)
+static inline int online_device_section(const struct mem_section *section)
 {
 	return 0;
 }
 #endif
 
 #ifdef CONFIG_SPARSEMEM_VMEMMAP_PREINIT
-static inline int preinited_vmemmap_section(struct mem_section *section)
+static inline int preinited_vmemmap_section(const struct mem_section *section)
 {
 	return (section &&
 		(section->section_mem_map & SECTION_IS_VMEMMAP_PREINIT));
@@ -2076,7 +2076,7 @@ void sparse_vmemmap_init_nid_early(int n
 void sparse_vmemmap_init_nid_late(int nid);
 
 #else
-static inline int preinited_vmemmap_section(struct mem_section *section)
+static inline int preinited_vmemmap_section(const struct mem_section *section)
 {
 	return 0;
 }
_

Patches currently in -mm which might be from max.kellermann@ionos.com are

pagevech-add-const-to-pointer-parameters-of-getter-functions.patch
huge_mmh-disallow-is_huge_zero_folionull.patch
mm-constify-shmem-related-test-functions-for-improved-const-correctness.patch
mm-constify-pagemap-related-test-getter-functions.patch
mm-constify-zone-related-test-getter-functions.patch
fs-constify-mapping-related-test-functions-for-improved-const-correctness.patch
mm-constify-process_shares_mm-for-improved-const-correctness.patch
mm-s390-constify-mapping-related-test-getter-functions.patch
parisc-constify-mmap_upper_limit-parameter.patch
mm-constify-arch_pick_mmap_layout-for-improved-const-correctness.patch
mm-constify-ptdesc_pmd_pts_count-and-folio_get_private.patch
mm-constify-various-inline-functions-for-improved-const-correctness.patch
mm-constify-assert-test-functions-in-mmh.patch
mm-constify-highmem-related-functions-for-improved-const-correctness.patch