Re: [PATCH] mm: use mapping_mapped to simplify the code

[Oscar Salvador (SUSE)]

On Fri, Jun 12, 2026 at 03:30:32PM +0800, Huang Shijie wrote:
> Use mapping_mapped() to simplify the code, make
> the code tidy and clean.
> 
> Reviewed-by: Pedro Falcato <pfalcato@xxxxxxx>
> Reviewed-by: Lorenzo Stoakes <ljs@xxxxxxxxxx>
> Signed-off-by: Huang Shijie <huangsj@xxxxxxxx>

Reviewed-by: Oscar Salvador (SUSE) <osalvador@xxxxxxxxxx>

> ---
>  fs/hugetlbfs/inode.c | 4 ++--
>  mm/memory.c          | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index 78d61bf2bd9b..216e1a0dd0b2 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -614,7 +614,7 @@ static void hugetlb_vmtruncate(struct inode *inode, loff_t offset)
>  
>  	i_size_write(inode, offset);
>  	i_mmap_lock_write(mapping);
> -	if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root))
> +	if (mapping_mapped(mapping))
>  		hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0,
>  				      ZAP_FLAG_DROP_MARKER);
>  	i_mmap_unlock_write(mapping);
> @@ -675,7 +675,7 @@ static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len)
>  
>  	/* Unmap users of full pages in the hole. */
>  	if (hole_end > hole_start) {
> -		if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root))
> +		if (mapping_mapped(mapping))
>  			hugetlb_vmdelete_list(&mapping->i_mmap,
>  					      hole_start >> PAGE_SHIFT,
>  					      hole_end >> PAGE_SHIFT, 0);
> diff --git a/mm/memory.c b/mm/memory.c
> index 86a973119bd4..5335077765e2 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -4386,7 +4386,7 @@ void unmap_mapping_folio(struct folio *folio)
>  	details.zap_flags = ZAP_FLAG_DROP_MARKER;
>  
>  	i_mmap_lock_read(mapping);
> -	if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)))
> +	if (unlikely(mapping_mapped(mapping)))
>  		unmap_mapping_range_tree(&mapping->i_mmap, first_index,
>  					 last_index, &details);
>  	i_mmap_unlock_read(mapping);
> @@ -4416,7 +4416,7 @@ void unmap_mapping_pages(struct address_space *mapping, pgoff_t start,
>  		last_index = ULONG_MAX;
>  
>  	i_mmap_lock_read(mapping);
> -	if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)))
> +	if (unlikely(mapping_mapped(mapping)))
>  		unmap_mapping_range_tree(&mapping->i_mmap, first_index,
>  					 last_index, &details);
>  	i_mmap_unlock_read(mapping);
> -- 
> 2.53.0
> 
> 

-- 
Oscar Salvador
SUSE Labs