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

Stephen Rothwell
2025-05-28T23:59:40Z

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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.

--
Cheers,
Stephen Rothwell

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