On Thu, Jul 10, 2025 at 02:26:38PM +0000, Jaegeuk Kim wrote:
> 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);
> }
No, you can pass a mutable folio to a function which takes a const
folio. Just not the other way around.
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