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From: Daniel Palmer <daniel@0x0f.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	linux-mm@kvack.org,  linux-kernel@vger.kernel.org,
	mm-commits@vger.kernel.org
Subject: Re: [GIT PULL] MM updates for 6.19-rc1
Date: Thu, 11 Dec 2025 20:12:18 +0900	[thread overview]
Message-ID: <CAFr9PX=_HaM3_xPtTiBn5Gw5-0xcRpawpJ02NStfdr0khF2k7g@mail.gmail.com> (raw)
In-Reply-To: <20251203212918.82f1c9d3947940aeae263878@linux-foundation.org>

Hi Andrew,

On Thu, 4 Dec 2025 at 14:29, Andrew Morton <akpm@linux-foundation.org> wrote:
>       mm/page_alloc: prevent reporting pcp->batch = 0

I think, maybe, the following part of this patch broke nommu.

-       new_batch = max(1, zone_batchsize(zone));
+       new_batch = zone_batchsize(zone);

Before this change on nommu zone_batchsize() returns 0 but the max()
changes it to 1. Now it'll stay as 0 and anywhere that depends on it
not being 0 won't work?

I'm seeing a deadlock on nommu:

https://lore.kernel.org/lkml/20251211102607.2538595-1-daniel@thingy.jp/

Thanks,

Daniel


  parent reply	other threads:[~2025-12-11 11:12 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-12-04  5:29 Andrew Morton
2025-12-05 21:56 ` Linus Torvalds
2025-12-06  2:54   ` Jason Gunthorpe
2025-12-06  3:43     ` Linus Torvalds
2025-12-05 22:14 ` pr-tracker-bot
2025-12-11 11:12 ` Daniel Palmer [this message]
2025-12-11 22:59   ` Joshua Hahn
2025-12-12  1:53     ` Joshua Hahn

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