From: "David Hildenbrand (Arm)" <david@kernel.org>
To: shao.mingyin@zte.com.cn, akpm@linux-foundation.org
Cc: linux-mm@kvack.org, ziy@nvidia.com, matthew.brost@intel.com,
joshua.hahnjy@gmail.com, byungchul@sk.com, gourry@gourry.net,
ying.huang@linux.alibaba.com, apopple@nvidia.com,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH v2] mm/migrate: fix softlockup in do_pages_move() with huge page arrays
Date: Mon, 9 Nov 2026 13:45:32 +0100 [thread overview]
Message-ID: <96984f8b-76be-4a41-9f4a-3e84b29fb1ab@kernel.org> (raw)
In-Reply-To: <20261109203320542JEYrsjSWEO22mMpmG7U_n@zte.com.cn>
On 11/9/26 13:33, shao.mingyin@zte.com.cn wrote:
> Hi David,
>
> fair enough -- and your reading is correct: preempt=none is unselectable
> under PREEMPT_DYNAMIC, and the arches that can still pick PREEMPT_NONE
> have no NUMA, so mainline cannot reach this path.
>
> I was aiming at the 6.6 LTS configs that shipped PREEMPT_NONE + NUMA: two
> lines of cond_resched(), no behaviour change, same as do_pages_stat() got
> in 8e934ab44389. If you and Andrew would rather not carry a stable-only
> fix, just say so and I will withdraw it.
I think this one will be the last ones where we do that and don't really have a
real workload run into it.
It's not a good use of our time and it doesn't make upstream any better :)
--
Cheers,
David
next prev parent reply other threads:[~2026-11-09 12:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-08 6:28 shao.mingyin
2026-11-09 12:19 ` David Hildenbrand (Arm)
2026-11-09 12:33 ` shao.mingyin
2026-11-09 12:45 ` David Hildenbrand (Arm) [this message]
2026-11-09 12:56 ` David Hildenbrand
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