From 0bf25cfc9e795ab302ee23550fdeebd2aeedf800 Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Mon, 1 Sep 2025 22:50:15 +0200 Subject: mm, s390: constify mapping related test/getter functions 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. (Even though seemingly unrelated, this also constifies the pointer parameter of mmap_is_legacy() in arch/s390/mm/mmap.c because a copy of the function exists in mm/util.c.) Link: https://lkml.kernel.org/r/20250901205021.3573313-7-max.kellermann@ionos.com Signed-off-by: Max Kellermann Reviewed-by: Vishal Moola (Oracle) Reviewed-by: Lorenzo Stoakes Acked-by: David Hildenbrand Acked-by: Vlastimil Babka Acked-by: Mike Rapoport (Microsoft) Acked-by: Shakeel Butt Cc: Alexander Gordeev Cc: Al Viro Cc: Andreas Larsson Cc: Andy Lutomirski Cc: Axel Rasmussen Cc: Baolin Wang Cc: Borislav Betkov Cc: Christian Borntraeger Cc: Christian Brauner Cc: Christian Zankel Cc: David Rientjes Cc: David S. Miller Cc: Gerald Schaefer Cc: Heiko Carstens Cc: Helge Deller Cc: "H. Peter Anvin" Cc: Hugh Dickins Cc: Ingo Molnar Cc: James Bottomley Cc: Jan Kara Cc: Jocelyn Falempe Cc: Liam Howlett Cc: Mark Brown Cc: Matthew Wilcox (Oracle) Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Hocko Cc: "Nysal Jan K.A" Cc: Oscar Salvador Cc: Peter Zijlstra Cc: Russel King Cc: Suren Baghdasaryan Cc: Sven Schnelle Cc: Thomas Gleinxer Cc: Thomas Huth Cc: Vasily Gorbik Cc: Wei Xu Cc: Yuanchu Xie Signed-off-by: Andrew Morton --- mm/util.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'mm/util.c') diff --git a/mm/util.c b/mm/util.c index e29d3310e26b..391f6e7daf83 100644 --- a/mm/util.c +++ b/mm/util.c @@ -315,7 +315,7 @@ void *memdup_user_nul(const void __user *src, size_t len) EXPORT_SYMBOL(memdup_user_nul); /* Check if the vma is being used as a stack by this task */ -int vma_is_stack_for_current(struct vm_area_struct *vma) +int vma_is_stack_for_current(const struct vm_area_struct *vma) { struct task_struct * __maybe_unused t = current; @@ -410,7 +410,7 @@ unsigned long arch_mmap_rnd(void) return rnd << PAGE_SHIFT; } -static int mmap_is_legacy(struct rlimit *rlim_stack) +static int mmap_is_legacy(const struct rlimit *rlim_stack) { if (current->personality & ADDR_COMPAT_LAYOUT) return 1; @@ -504,7 +504,7 @@ EXPORT_SYMBOL_IF_KUNIT(arch_pick_mmap_layout); * * -ENOMEM if RLIMIT_MEMLOCK would be exceeded. */ int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc, - struct task_struct *task, bool bypass_rlim) + const struct task_struct *task, bool bypass_rlim) { unsigned long locked_vm, limit; int ret = 0; @@ -688,7 +688,7 @@ struct anon_vma *folio_anon_vma(const struct folio *folio) * You can call this for folios which aren't in the swap cache or page * cache and it will return NULL. */ -struct address_space *folio_mapping(struct folio *folio) +struct address_space *folio_mapping(const struct folio *folio) { struct address_space *mapping; @@ -926,7 +926,7 @@ EXPORT_SYMBOL_GPL(vm_memory_committed); * Note this is a helper function intended to be used by LSMs which * wish to use this logic. */ -int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) +int __vm_enough_memory(const struct mm_struct *mm, long pages, int cap_sys_admin) { long allowed; unsigned long bytes_failed; -- cgit v1.2.3