linux-kernel - Re: linux-next: build failure after merge of almost all the trees

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Date:   Tue, 2 Nov 2021 23:13:07 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Anton Altaparmakov <anton@...era.com>,
        Joel Stanley <joel@....id.au>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: linux-next: build failure after merge of almost all the trees

Hi Arnd,

On Tue, 2 Nov 2021 08:06:10 +0100 Arnd Bergmann <arnd@...db.de> wrote:
>
> On Tue, Nov 2, 2021 at 7:44 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > On Thu, 28 Oct 2021 23:38:44 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:  
> > >
> > > On Thu, 28 Oct 2021 21:26:51 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:  
> > > >
> > > > Today's linux-next build (powerpc allyesconfig) failed like this:
> > > >
> > > > fs/ntfs/aops.c: In function 'ntfs_write_mst_block':
> > > > fs/ntfs/aops.c:1311:1: error: the frame size of 2304 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
> > > >  1311 | }
> > > >       | ^
> > > > cc1: all warnings being treated as errors
> > > >
> > > > I have no idea what has caused this.  
> > >
> > > With a nudge from Arnd, it seems the immediate case was commit
> > >
> > >   f22969a66041 ("powerpc/64s: Default to 64K pages for 64 bit book3s")
> > >
> > > from the powerpc tree switching the allyesconfig build from 4k pages to
> > > 64k pages which expanded a few arrays on the stack in that function.  
> >
> > Can we do something about this, please?  
> 
> I submitted a workaround a while ago. Anton didn't like it, but has not
> come up with a proper fix in ntfs either:
> 
> https://lore.kernel.org/lkml/20210927141815.1711736-1-arnd@kernel.org/
> 
> It does need to be changed a bit as I realized it depends on a rework of
> the Kconfig logic that I had in my randconfig build tree to have a common
> page size symbol across architectures. Without my other patch, it also
> needs to check for PPC_64K_PAGES.
> 
> Should I send an updated version of the patch?

That would be good, thanks.

Even better would be to split up the function some how, but having had
a bit of a look at it, that may be a much longer job.  I am assuming
that allocations (or their failure) are out of the question in that
particular function.

-- 
Cheers,
Stephen Rothwell

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