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Message-ID: <20250901205021.3573313-1-max.kellermann@ionos.com>
Date: Mon, 1 Sep 2025 22:50:09 +0200
From: Max Kellermann <max.kellermann@...os.com>
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Subject: [PATCH v6 00/12] mm: establish const-correctness for pointer parameters
For improved const-correctness in the low-level memory-management
subsystem, which provides a basis for further const-ification further
up the call stack (e.g. filesystems).
This patch series splitted into smaller patches was initially posted
as a single large patch:
https://lore.kernel.org/lkml/20250827192233.447920-1-max.kellermann@ionos.com/
I started this work when I tried to constify the Ceph filesystem code,
but found that to be impossible because many "mm" functions accept
non-const pointer, even though they modify nothing.
Signed-off-by: Max Kellermann <max.kellermann@...os.com>
---
v1 -> v2:
- made several parameter values const (i.e. the pointer address, not
just the pointed-to memory), as suggested by Andrew Morton and
Yuanchu Xie
- drop existing+obsolete "extern" keywords on lines modified by these
patches (suggested by Vishal Moola)
- add missing parameter names on lines modified by these patches
(suggested by Vishal Moola)
- more "const" pointers (e.g. the task_struct passed to
process_shares_mm())
- add missing "const" to s390, fixing s390 build failure
- moved the mmap_is_legacy() change in arch/s390/mm/mmap.c from 08/12
to 06/12 (suggested by Vishal Moola)
v2 -> v3:
- remove garbage from 06/12
- changed tags on subject line (suggested by Matthew Wilcox)
v3 -> v4:
- more verbose commit messages including a listing of function names
(suggested by David Hildenbrand and Lorenzo Stoakes)
v4 -> v5:
- back to shorter commit messages after an agreement between David
Hildenbrand and Lorenzo Stoakes was found
v5 -> v6:
- fix inconsistent constness of assert_fault_locked()
- revert the const parameter value change from v2 (requested by
Lorenzo Stoakes)
- revert the long cover letter, removing long explanations again
(requested by Lorenzo Stoakes)
Max Kellermann (12):
mm: constify shmem related test functions for improved
const-correctness
mm: constify pagemap related test/getter functions
mm: constify zone related test/getter functions
fs: constify mapping related test functions for improved
const-correctness
mm: constify process_shares_mm() for improved const-correctness
mm, s390: constify mapping related test/getter functions
parisc: constify mmap_upper_limit() parameter
mm: constify arch_pick_mmap_layout() for improved const-correctness
mm: constify ptdesc_pmd_pts_count() and folio_get_private()
mm: constify various inline functions for improved const-correctness
mm: constify assert/test functions in mm.h
mm: constify highmem related functions for improved const-correctness
arch/arm/include/asm/highmem.h | 6 +--
arch/parisc/include/asm/processor.h | 2 +-
arch/parisc/kernel/sys_parisc.c | 2 +-
arch/s390/mm/mmap.c | 6 +--
arch/sparc/kernel/sys_sparc_64.c | 2 +-
arch/x86/mm/mmap.c | 6 +--
arch/xtensa/include/asm/highmem.h | 2 +-
include/linux/fs.h | 6 +--
include/linux/highmem-internal.h | 36 +++++++++---------
include/linux/highmem.h | 8 ++--
include/linux/mm.h | 56 +++++++++++++--------------
include/linux/mm_inline.h | 25 ++++++------
include/linux/mm_types.h | 4 +-
include/linux/mmzone.h | 42 ++++++++++----------
include/linux/pagemap.h | 59 +++++++++++++++--------------
include/linux/sched/mm.h | 4 +-
include/linux/shmem_fs.h | 4 +-
mm/highmem.c | 10 ++---
mm/oom_kill.c | 6 +--
mm/shmem.c | 6 +--
mm/util.c | 16 ++++----
21 files changed, 155 insertions(+), 153 deletions(-)
--
2.47.2
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