[PATCH v3 1/3] mm/vma: const-ify vma_assert_stabilised() and associated functions

[Lorenzo Stoakes (ARM)]

The vma pointers are not modified in any of these functions so make it
official by const-ify them.

Propagate this throughout the call stack.

No functional change intended.

Signed-off-by: Lorenzo Stoakes (ARM) <ljs@xxxxxxxxxx>
---
 include/linux/mmap_lock.h       | 12 ++++++------
 tools/testing/vma/include/dup.h |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 00eae65b74bd..03e1eb136111 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -273,7 +273,7 @@ static inline void vma_end_read(struct vm_area_struct *vma)
 	vma_refcount_put(vma);
 }
 
-static inline unsigned int __vma_raw_mm_seqnum(struct vm_area_struct *vma)
+static inline unsigned int __vma_raw_mm_seqnum(const struct vm_area_struct *vma)
 {
 	const struct mm_struct *mm = vma->vm_mm;
 
@@ -288,7 +288,7 @@ static inline unsigned int __vma_raw_mm_seqnum(struct vm_area_struct *vma)
  *
  * Returns true if write-locked, otherwise false.
  */
-static inline bool __is_vma_write_locked(struct vm_area_struct *vma)
+static inline bool __is_vma_write_locked(const struct vm_area_struct *vma)
 {
 	/*
 	 * current task is holding mmap_write_lock, both vma->vm_lock_seq and
@@ -344,7 +344,7 @@ int vma_start_write_killable(struct vm_area_struct *vma)
  * vma_assert_write_locked() - assert that @vma holds a VMA write lock.
  * @vma: The VMA to assert.
  */
-static inline void vma_assert_write_locked(struct vm_area_struct *vma)
+static inline void vma_assert_write_locked(const struct vm_area_struct *vma)
 {
 	if (!IS_ENABLED(CONFIG_MMU)) {
 		mmap_assert_write_locked(vma->vm_mm);
@@ -359,7 +359,7 @@ static inline void vma_assert_write_locked(struct vm_area_struct *vma)
  * lock and is not detached.
  * @vma: The VMA to assert.
  */
-static inline void vma_assert_locked(struct vm_area_struct *vma)
+static inline void vma_assert_locked(const struct vm_area_struct *vma)
 {
 	unsigned int refcnt;
 
@@ -410,7 +410,7 @@ static inline void vma_assert_locked(struct vm_area_struct *vma)
  * With lockdep disabled we may sometimes race with other threads acquiring the
  * mmap read lock simultaneous with our VMA read lock.
  */
-static inline void vma_assert_stabilised(struct vm_area_struct *vma)
+static inline void vma_assert_stabilised(const struct vm_area_struct *vma)
 {
 	/*
 	 * If another thread owns an mmap lock, it may go away at any time, and
@@ -445,7 +445,7 @@ static inline void vma_assert_stabilised(struct vm_area_struct *vma)
 	vma_assert_locked(vma);
 }
 
-static inline bool vma_is_attached(struct vm_area_struct *vma)
+static inline bool vma_is_attached(const struct vm_area_struct *vma)
 {
 	return refcount_read(&vma->vm_refcnt);
 }
diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h
index 16c09dac59d9..17505bcf9cf6 100644
--- a/tools/testing/vma/include/dup.h
+++ b/tools/testing/vma/include/dup.h
@@ -1179,7 +1179,7 @@ static inline struct vm_area_struct *vma_next(struct vma_iterator *vmi)
 	return mas_find(&vmi->mas, ULONG_MAX);
 }
 
-static inline bool vma_is_attached(struct vm_area_struct *vma)
+static inline bool vma_is_attached(const struct vm_area_struct *vma)
 {
 	return refcount_read(&vma->vm_refcnt);
 }

-- 
2.55.0