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

Stephen Rothwell
2025-05-29T01:57:04Z

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Hi Andrew,

On Wed, 28 May 2025 17:02:56 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Thu, 29 May 2025 09:59:38 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> > Hi all,
> >
> > After merging the mm-hotfixes tree, today's linux-next build (powerpc
> > ppc64_defconfig) failed like this:
> >
> > mm/khugepaged.c: In function 'hpage_collapse_scan_file':
> > mm/khugepaged.c:2337:21: error: implicit declaration of function 'folio_expected_ref_count' [-Wimplicit-function-declaration]
> > 2337 | if (folio_expected_ref_count(folio) + 1 != folio_ref_count(folio)) {
> > | ^~~~~~~~~~~~~~~~~~~~~~~~
> >
> > Caused by commit
> >
> > 3bdddbba5f02 ("mm/khugepaged: fix race with folio split/free using temporary reference")
> >
> > I have reverted that commit for today.
>
> yup, thanks, that was dependent on an mm-stable patch! I have
> reordered things to plug the bisection hole.

Snap!

--
Cheers,
Stephen Rothwell

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