linux-kernel - Re: [PATCH] cxl/region: Support multi-level interleaving with smaller granularities for lower levels

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Message-ID: <aQS8zJ4p-r5iSgd1@gourry-fedora-PF4VCD3F>
Date: Fri, 31 Oct 2025 09:42:36 -0400
From: Gregory Price <gourry@...rry.net>
To: kernel test robot <lkp@...el.com>
Cc: Robert Richter <rrichter@....com>,
	Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Davidlohr Bueso <dave@...olabs.net>, oe-kbuild-all@...ts.linux.dev,
	linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
	Terry Bowman <terry.bowman@....com>,
	Joshua Hahn <joshua.hahnjy@...il.com>
Subject: Re: [PATCH] cxl/region: Support multi-level interleaving with
 smaller granularities for lower levels

On Fri, Oct 31, 2025 at 03:03:10PM +0800, kernel test robot wrote:
> Hi Robert,
> 
> All errors (new ones prefixed by >>, old ones prefixed by <<):
> 
> >> ERROR: modpost: "__udivdi3" [drivers/cxl/core/cxl_core.ko] undefined!
> 

IIRC this happens when you do 64-bit division because it's annoying and
complicated. Ran into this madness in mempolicy.

~Gregory