For improved const-correctness.
This work was initially posted here:
https://lore.kernel.org/lkml/20250827192233.447920-1-max.kellermann@ionos.com/
.. but got rejected by Lorenzo Stoakes:
https://lore.kernel.org/lkml/d6bf808d-7d74-4e22-ac4b-a6d1f4892262@lucifer.local/
David Hildenbrand and Lorenzo Stoakes suggested splitting the patch
into smaller chunks. My second attempt with one smaller patch was met
with agreement:
https://lore.kernel.org/lkml/20250828130311.772993-1-max.kellermann@ionos.com/
Now this is the rest of the initial patch in small pieces, plus some
more.
Establishing const-correctness in this low-level part of the kernel
enables doing the same in higher-level parts, e.g. filesystems.
Signed-off-by: Max Kellermann <max.kellermann@ionos.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)
Max Kellermann (12):
mm/shmem: add `const` to lots of pointer parameters
include/pagemap.h: add `const` to lots of pointer parameters
include/mmzone.h: add `const` to lots of pointer parameters
include/fs.h: add `const` to several pointer parameters
mm/oom_kill: add `const` to pointer parameter
mm/util: add `const` to several pointer parameters
parisc/sys_parisc.c: add `const` to mmap_upper_limit() parameter
arch, mm/util: add const to arch_pick_mmap_layout() parameter
include/mm_types.h: add `const` to several pointer parameters
include/mm_inline.h: add `const` to lots of pointer parameters
include/mm.h: add `const` to lots of pointer parameters
mm/highmem: add `const` to lots of pointer parameters
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 | 7 ++--
arch/sparc/kernel/sys_sparc_64.c | 5 ++-
arch/x86/mm/mmap.c | 7 ++--
arch/xtensa/include/asm/highmem.h | 2 +-
include/linux/fs.h | 7 ++--
include/linux/highmem-internal.h | 38 ++++++++++---------
include/linux/highmem.h | 8 ++--
include/linux/mm.h | 48 +++++++++++------------
include/linux/mm_inline.h | 26 +++++++------
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 | 3 +-
mm/shmem.c | 6 +--
mm/util.c | 20 ++++++----
21 files changed, 163 insertions(+), 147 deletions(-)
--
2.47.2