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

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Message-ID: <20250529115702.3e4f8874@canb.auug.org.au>
Date: Thu, 29 May 2025 11:57:02 +1000
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Andrew Morton <akpm@...ux-foundation.org>
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

Hi Andrew,

On Wed, 28 May 2025 17:02:56 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> 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.

Snap!

-- 
Cheers,
Stephen Rothwell

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