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Message-Id: <20250528170256.8638353ab1b5b434a9ad7c11@linux-foundation.org>
Date: Wed, 28 May 2025 17:02:56 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Shivank Garg <shivankg@....com>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the mm-hotfixes tree

On Thu, 29 May 2025 09:59:38 +1000 Stephen Rothwell <sfr@...b.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.

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