Subject: Re: linux-next: build failure after merge of the mm-hotfixes tree

From: Stephen Rothwell <[email-masked]>
Date: Mon, 1 Jul 2024 11:01:59 +1000

Hi all,

On Mon, 1 Jul 2024 10:16:41 +1000 Stephen Rothwell <[email-masked]> wrote:
>
> After merging the mm-hotfixes tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:
> 
> mm/gup.c: In function 'gup_hugepte':
> mm/gup.c:474:25: error: implicit declaration of function 'try_grab_folio_fast'; did you mean 'try_grab_folio'? [-Werror=implicit-function-declaration]
>   474 |                 folio = try_grab_folio_fast(page, refs, flags);
>       |                         ^~~~~~~~~~~~~~~~~~~
>       |                         try_grab_folio
> mm/gup.c:474:23: warning: assignment to 'struct folio *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
>   474 |                 folio = try_grab_folio_fast(page, refs, flags);
>       |                       ^
> mm/gup.c: At top level:
> mm/gup.c:2747:22: error: conflicting types for 'try_grab_folio_fast'; have 'struct folio *(struct page *, int,  unsigned int)'
>  2747 | static struct folio *try_grab_folio_fast(struct page *page, int refs,
>       |                      ^~~~~~~~~~~~~~~~~~~
> mm/gup.c:474:25: note: previous implicit declaration of 'try_grab_folio_fast' with type 'int()'
>   474 |                 folio = try_grab_folio_fast(page, refs, flags);
>       |                         ^~~~~~~~~~~~~~~~~~~
> cc1: some warnings being treated as errors
> 
> Caused by commit
> 
>   5f408bfe0d13 ("mm: gup: stop abusing try_grab_folio")
> 
> I have reverted that commit for today.

And I also had to revert commit

  52cca85b0ebf ("mm-gup-introduce-memfd_pin_folios-for-pinning-memfd-folios-fix")

from the mm-unstable branch of the mm tree.

-- 
Cheers,
Stephen Rothwell