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Date: Tue, 23 Dec 2025 08:54:34 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Sasha Levin <sashal@kernel.org>
Cc: SeongJae Park <sj@kernel.org>, "David Hildenbrand (Red Hat)"
 <david@kernel.org>, "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>, Sourabh
 Jain <sourabhjain@linux.ibm.com>, Borislav Petkov <bp@alien8.de>,
 Christophe Leroy <christophe.leroy@csgroup.eu>, Heiko Carstens
 <hca@linux.ibm.com>, Ingo Molnar <mingo@redhat.com>, Madhavan Srinivasan
 <maddy@linux.ibm.com>, Michael Ellerman <mpe@ellerman.id.au>, Muchun Song
 <muchun.song@linux.dev>, Oscar Salvador <osalvador@suse.de>, Thomas
 Gleixner <tglx@linutronix.de>, Vasily Gorbik <gor@linux.ibm.com>,
 linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
 linux-s390@vger.kernel.org, x86@kernel.org,
 linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6] mm/hugetlb: ignore hugepage kernel args if hugepages
 are unsupported
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On Tue, 23 Dec 2025 06:43:45 -0500 Sasha Levin <sashal@kernel.org> wrote:

> >> > Yes, -stable maintainers have been asked to only backport patches where
> >> > the MM developers asked for that, with cc:stable.  There may be
> >> > slipups, but as far as I know this is working.
> >> >
> >> > I don't actually know how they determine which patches need this
> >> > special treatment.  Pathname?  Signed-off-by:akpm?
> >>
> >> I guess it is pathname, based on ignore_list file [1] of stable-queue repo.
> >>
> >> [1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/ignore_list#n16
> >>
> >
> >Oh, that's a bit sad.
> >
> >- other trees sometimes mess with mm/ and they probably aren't aware
> >  that they need an explicit cc:stable.
> >
> >- misses drivers/block/zram and probably various other things that
> >  the MM team maintains.
> >
> >Oh well, I guess simple mm/* coverage is good enough.  But I do worry a
> >little that useful fixes coming into mm/ via other trees without
> >cc:stable will get missed.
> 
> How should we improve the filter? mm/ AND signed off by akpm?

I think just signed-off-by:akpm please.  That way, mm fixes which come
in via other trees without cc:stable get backported.

Obviously we'd prefer that such patches get appropriate consideration
by the MM developers but sometimes other-tree people aren't that
cooperative.  In this case it's better to backport the thing rather
than missing a fix?