Make it clear we're referencing an unsafe variant of this function
explicitly.

This is laying the foundation for exposing more such functions and
maintaining a consistent naming scheme.

As a part of this change, rename check_ops_valid() to check_ops_safe() for
consistency.

Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
---
 mm/internal.h |  2 +-
 mm/madvise.c  |  4 ++--
 mm/pagewalk.c | 22 +++++++++++-----------
 3 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index 0af87f6c2889..479234b39394 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1652,7 +1652,7 @@ static inline void accept_page(struct page *page)
 #endif /* CONFIG_UNACCEPTED_MEMORY */
 
 /* pagewalk.c */
-int walk_page_range_mm(struct mm_struct *mm, unsigned long start,
+int walk_page_range_mm_unsafe(struct mm_struct *mm, unsigned long start,
 		unsigned long end, const struct mm_walk_ops *ops,
 		void *private);
 int walk_page_range_debug(struct mm_struct *mm, unsigned long start,
diff --git a/mm/madvise.c b/mm/madvise.c
index de918b107cfc..7b938ff44be2 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1171,8 +1171,8 @@ static long madvise_guard_install(struct madvise_behavior *madv_behavior)
 		unsigned long nr_pages = 0;
 
 		/* Returns < 0 on error, == 0 if success, > 0 if zap needed. */
-		err = walk_page_range_mm(vma->vm_mm, range->start, range->end,
-					 &guard_install_walk_ops, &nr_pages);
+		err = walk_page_range_mm_unsafe(vma->vm_mm, range->start,
+				range->end, &guard_install_walk_ops, &nr_pages);
 		if (err < 0)
 			return err;
 
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 6cace2c8814a..ab29b16abd2c 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -452,7 +452,7 @@ static inline void process_vma_walk_lock(struct vm_area_struct *vma,
  * We usually restrict the ability to install PTEs, but this functionality is
  * available to internal memory management code and provided in mm/internal.h.
  */
-int walk_page_range_mm(struct mm_struct *mm, unsigned long start,
+int walk_page_range_mm_unsafe(struct mm_struct *mm, unsigned long start,
 		unsigned long end, const struct mm_walk_ops *ops,
 		void *private)
 {
@@ -518,10 +518,10 @@ int walk_page_range_mm(struct mm_struct *mm, unsigned long start,
  * This check is performed on all functions which are parameterised by walk
  * operations and exposed in include/linux/pagewalk.h.
  *
- * Internal memory management code can use the walk_page_range_mm() function to
- * be able to use all page walking operations.
+ * Internal memory management code can use *_unsafe() functions to be able to
+ * use all page walking operations.
  */
-static bool check_ops_valid(const struct mm_walk_ops *ops)
+static bool check_ops_safe(const struct mm_walk_ops *ops)
 {
 	/*
 	 * The installation of PTEs is solely under the control of memory
@@ -579,10 +579,10 @@ int walk_page_range(struct mm_struct *mm, unsigned long start,
 		unsigned long end, const struct mm_walk_ops *ops,
 		void *private)
 {
-	if (!check_ops_valid(ops))
+	if (!check_ops_safe(ops))
 		return -EINVAL;
 
-	return walk_page_range_mm(mm, start, end, ops, private);
+	return walk_page_range_mm_unsafe(mm, start, end, ops, private);
 }
 
 /**
@@ -639,7 +639,7 @@ int walk_kernel_page_table_range_lockless(unsigned long start, unsigned long end
 
 	if (start >= end)
 		return -EINVAL;
-	if (!check_ops_valid(ops))
+	if (!check_ops_safe(ops))
 		return -EINVAL;
 
 	return walk_pgd_range(start, end, &walk);
@@ -678,7 +678,7 @@ int walk_page_range_debug(struct mm_struct *mm, unsigned long start,
 						    pgd, private);
 	if (start >= end || !walk.mm)
 		return -EINVAL;
-	if (!check_ops_valid(ops))
+	if (!check_ops_safe(ops))
 		return -EINVAL;
 
 	/*
@@ -709,7 +709,7 @@ int walk_page_range_vma(struct vm_area_struct *vma, unsigned long start,
 		return -EINVAL;
 	if (start < vma->vm_start || end > vma->vm_end)
 		return -EINVAL;
-	if (!check_ops_valid(ops))
+	if (!check_ops_safe(ops))
 		return -EINVAL;
 
 	process_mm_walk_lock(walk.mm, ops->walk_lock);
@@ -729,7 +729,7 @@ int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
 
 	if (!walk.mm)
 		return -EINVAL;
-	if (!check_ops_valid(ops))
+	if (!check_ops_safe(ops))
 		return -EINVAL;
 
 	process_mm_walk_lock(walk.mm, ops->walk_lock);
@@ -780,7 +780,7 @@ int walk_page_mapping(struct address_space *mapping, pgoff_t first_index,
 	unsigned long start_addr, end_addr;
 	int err = 0;
 
-	if (!check_ops_valid(ops))
+	if (!check_ops_safe(ops))
 		return -EINVAL;
 
 	lockdep_assert_held(&mapping->i_mmap_rwsem);
-- 
2.51.0