Re: [PATCH v2 1/2] mm: rename walk_page_range_mm()

[Vlastimil Babka <vbabka@suse.cz>]

On 11/10/25 18:22, Lorenzo Stoakes wrote:
> 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>

Reviewed-by: Vlastimil Babka <vbabka@suse.cz>

> ---
>  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);