Re: [GIT PULL] MM updates for 6.19-rc1

[Daniel Palmer]

Hi Andrew,

On Thu, 4 Dec 2025 at 14:29, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxx/

Thanks,

Daniel