linux-kernel - Re: [PATCH 0/6] CXL: Introduce memory controller abstraction and sysram controller

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Message-ID: <aWZJoBwSLl8ukFZd@gourry-fedora-PF4VCD3F>
Date: Tue, 13 Jan 2026 08:33:20 -0500
From: Gregory Price <gourry@...rry.net>
To: Neeraj Kumar <s.neeraj@...sung.com>
Cc: linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...a.com, dave@...olabs.net,
	jonathan.cameron@...wei.com, dave.jiang@...el.com,
	alison.schofield@...el.com, vishal.l.verma@...el.com,
	ira.weiny@...el.com, dan.j.williams@...el.com, gost.dev@...sung.com,
	neeraj.kernel@...il.com, cpgs@...sung.com
Subject: Re: [PATCH 0/6] CXL: Introduce memory controller abstraction and
 sysram controller

On Tue, Jan 13, 2026 at 03:07:49PM +0530, Neeraj Kumar wrote:
> Hi Gregory,
> 
> I am facing compilation issue with this series using CONFIG_CXL_BUS=m
> {{{
> 	  AR      drivers/built-in.a
> 	  AR      built-in.a
> 	  AR      vmlinux.a
> 	  LD      vmlinux.o
> 	  MODPOST Module.symvers
> 	ERROR: modpost: "device_offline" [drivers/cxl/core/cxl_core.ko] undefined!
> 	ERROR: modpost: "lock_device_hotplug_sysfs" [drivers/cxl/core/cxl_core.ko] undefined!
> 	ERROR: modpost: "unlock_device_hotplug" [drivers/cxl/core/cxl_core.ko] undefined!
> 	ERROR: modpost: "device_online" [drivers/cxl/core/cxl_core.ko] undefined!
> 	ERROR: modpost: "walk_memory_blocks" [drivers/cxl/core/cxl_core.ko] undefined!
> 	make[2]: *** [scripts/Makefile.modpost:147: Module.symvers] Error 1
> 	make[1]: *** [/mnt/ssd1/neeraj/dcd/cxl_env/cxl-linux-mainline/Makefile:2004: modpost] Error 2
> 	make: *** [Makefile:248: __sub-make] Error 2
> }}}
> 
> Above routines are not EXPORT_SYMBOL_GPL(), thats why with
> "CONFIG_CXL_BUS=m" its breaking.
> 
> After adding following EXPORT_SYMBOL_GPL() below their respective
> routines. This issue is fixed.
> {{{
> 	EXPORT_SYMBOL_GPL(unlock_device_hotplug);
> 	EXPORT_SYMBOL_GPL(lock_device_hotplug_sysfs);
> 	EXPORT_SYMBOL_GPL(device_offline);
> 	EXPORT_SYMBOL_GPL(device_online);
> 	EXPORT_SYMBOL_GPL(walk_memory_blocks);
> }}}
> 
> Can you please have a look?
>

Much appreciated, will fixup!

~Gregory