linux-kernel - Re: [PATCH v6] mm/hugetlb: ignore hugepage kernel args if hugepages are unsupported

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Message-Id: <20251223085434.a6d6ae08c3aedf420908f404@linux-foundation.org>
Date: Tue, 23 Dec 2025 08:54:34 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Sasha Levin <sashal@...nel.org>
Cc: SeongJae Park <sj@...nel.org>, "David Hildenbrand (Red Hat)"
 <david@...nel.org>, "Ritesh Harjani (IBM)" <ritesh.list@...il.com>, Sourabh
 Jain <sourabhjain@...ux.ibm.com>, Borislav Petkov <bp@...en8.de>,
 Christophe Leroy <christophe.leroy@...roup.eu>, Heiko Carstens
 <hca@...ux.ibm.com>, Ingo Molnar <mingo@...hat.com>, Madhavan Srinivasan
 <maddy@...ux.ibm.com>, Michael Ellerman <mpe@...erman.id.au>, Muchun Song
 <muchun.song@...ux.dev>, Oscar Salvador <osalvador@...e.de>, Thomas
 Gleixner <tglx@...utronix.de>, Vasily Gorbik <gor@...ux.ibm.com>,
 linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
 linux-s390@...r.kernel.org, x86@...nel.org,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] mm/hugetlb: ignore hugepage kernel args if hugepages
 are unsupported

On Tue, 23 Dec 2025 06:43:45 -0500 Sasha Levin <sashal@...nel.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?