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Message-ID: <20250901205021.3573313-2-max.kellermann@ionos.com>
Date: Mon, 1 Sep 2025 22:50:10 +0200
From: Max Kellermann <max.kellermann@...os.com>
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Subject: [PATCH v6 01/12] mm: constify shmem related test 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.
Signed-off-by: Max Kellermann <max.kellermann@...os.com>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Acked-by: David Hildenbrand <david@...hat.com>
---
include/linux/mm.h | 8 ++++----
include/linux/shmem_fs.h | 4 ++--
mm/shmem.c | 6 +++---
3 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index cd14298bb958..18deb14cb1f5 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -979,11 +979,11 @@ static inline void vma_iter_set(struct vma_iterator *vmi, unsigned long addr)
* The vma_is_shmem is not inline because it is used only by slow
* paths in userfault.
*/
-bool vma_is_shmem(struct vm_area_struct *vma);
-bool vma_is_anon_shmem(struct vm_area_struct *vma);
+bool vma_is_shmem(const struct vm_area_struct *vma);
+bool vma_is_anon_shmem(const struct vm_area_struct *vma);
#else
-static inline bool vma_is_shmem(struct vm_area_struct *vma) { return false; }
-static inline bool vma_is_anon_shmem(struct vm_area_struct *vma) { return false; }
+static inline bool vma_is_shmem(const struct vm_area_struct *vma) { return false; }
+static inline bool vma_is_anon_shmem(const struct vm_area_struct *vma) { return false; }
#endif
int vma_is_stack_for_current(struct vm_area_struct *vma);
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index 6d0f9c599ff7..0e47465ef0fd 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -99,9 +99,9 @@ extern unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags);
extern int shmem_lock(struct file *file, int lock, struct ucounts *ucounts);
#ifdef CONFIG_SHMEM
-bool shmem_mapping(struct address_space *mapping);
+bool shmem_mapping(const struct address_space *mapping);
#else
-static inline bool shmem_mapping(struct address_space *mapping)
+static inline bool shmem_mapping(const struct address_space *mapping)
{
return false;
}
diff --git a/mm/shmem.c b/mm/shmem.c
index 640fecc42f60..2df26f4d6e60 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -275,18 +275,18 @@ static const struct vm_operations_struct shmem_vm_ops;
static const struct vm_operations_struct shmem_anon_vm_ops;
static struct file_system_type shmem_fs_type;
-bool shmem_mapping(struct address_space *mapping)
+bool shmem_mapping(const struct address_space *mapping)
{
return mapping->a_ops == &shmem_aops;
}
EXPORT_SYMBOL_GPL(shmem_mapping);
-bool vma_is_anon_shmem(struct vm_area_struct *vma)
+bool vma_is_anon_shmem(const struct vm_area_struct *vma)
{
return vma->vm_ops == &shmem_anon_vm_ops;
}
-bool vma_is_shmem(struct vm_area_struct *vma)
+bool vma_is_shmem(const struct vm_area_struct *vma)
{
return vma_is_anon_shmem(vma) || vma->vm_ops == &shmem_vm_ops;
}
--
2.47.2
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