linux-kernel - Re: [PATCH v6 04/12] fs: constify mapping related test functions for improved const-correctness

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Message-ID: <xn6tybxhnrswd5wnhfkt4h2n7romogag2ls7ehzte4r2oxoe6u@4pa7726gzcgj>
Date: Tue, 2 Sep 2025 12:42:41 +0200
From: Jan Kara <jack@...e.cz>
To: Max Kellermann <max.kellermann@...os.com>
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Subject: Re: [PATCH v6 04/12] fs: constify mapping related test functions for
 improved const-correctness

On Mon 01-09-25 22:50:13, Max Kellermann wrote:
> 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>

Looks good to me. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  include/linux/fs.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 3b9f54446db0..0b43edb33be2 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -537,7 +537,7 @@ struct address_space {
>  /*
>   * Returns true if any of the pages in the mapping are marked with the tag.
>   */
> -static inline bool mapping_tagged(struct address_space *mapping, xa_mark_t tag)
> +static inline bool mapping_tagged(const struct address_space *mapping, xa_mark_t tag)
>  {
>  	return xa_marked(&mapping->i_pages, tag);
>  }
> @@ -585,7 +585,7 @@ static inline void i_mmap_assert_write_locked(struct address_space *mapping)
>  /*
>   * Might pages of this file be mapped into userspace?
>   */
> -static inline int mapping_mapped(struct address_space *mapping)
> +static inline int mapping_mapped(const struct address_space *mapping)
>  {
>  	return	!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root);
>  }
> @@ -599,7 +599,7 @@ static inline int mapping_mapped(struct address_space *mapping)
>   * If i_mmap_writable is negative, no new writable mappings are allowed. You
>   * can only deny writable mappings, if none exists right now.
>   */
> -static inline int mapping_writably_mapped(struct address_space *mapping)
> +static inline int mapping_writably_mapped(const struct address_space *mapping)
>  {
>  	return atomic_read(&mapping->i_mmap_writable) > 0;
>  }
> -- 
> 2.47.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR