Re: [jaegeuk-f2fs:dev-test 65/93] fs/f2fs/data.c:58:56: error: passing 'const struct folio *' to parameter of type 'struct folio *' discards qualifiers

[Jaegeuk Kim <jaegeuk@kernel.org>]

On 07/10, Matthew Wilcox wrote:
> On Thu, Jul 10, 2025 at 03:17:28PM +0800, kernel test robot wrote:
> > >> fs/f2fs/data.c:58:56: error: passing 'const struct folio *' to parameter of type 'struct folio *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
> >       58 |                 return folio_test_f2fs_gcing(fscrypt_pagecache_folio(folio));
> >          |                                                                      ^~~~~
> >    include/linux/fscrypt.h:527:67: note: passing argument to parameter 'bounce_folio' here
> >      527 | static inline struct folio *fscrypt_pagecache_folio(struct folio *bounce_folio)
> 
> Ah; I changed only one of the definitions of fscrypt_pagecache_folio.
> 
> Jaegeuk, can you fold in this fix?

Will this break ext4?

In ext4,
		struct folio *folio = fi.folio;
		...

		if (fscrypt_is_bounce_folio(folio)) {
			io_folio = folio;
			folio = fscrypt_pagecache_folio(folio);
		}

> 
> diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h
> index b334c0538864..8d9127a0fdb3 100644
> --- a/include/linux/fscrypt.h
> +++ b/include/linux/fscrypt.h
> @@ -524,7 +524,8 @@ static inline bool fscrypt_is_bounce_folio(const struct folio *folio)
>  	return false;
>  }
>  
> -static inline struct folio *fscrypt_pagecache_folio(struct folio *bounce_folio)
> +static inline
> +struct folio *fscrypt_pagecache_folio(const struct folio *bounce_folio)
>  {
>  	WARN_ON_ONCE(1);
>  	return ERR_PTR(-EINVAL);