linux-kernel - Re: [PATCH 3/8] mm/memory_hotplug: add APIs for explicit online type control

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Message-ID: <aXPIGMVAvVEBgFhJ@gourry-fedora-PF4VCD3F>
Date: Fri, 23 Jan 2026 14:12:24 -0500
From: Gregory Price <gourry@...rry.net>
To: Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: "David Hildenbrand (Red Hat)" <david@...nel.org>, linux-mm@...ck.org,
	linux-cxl@...r.kernel.org, nvdimm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev,
	kernel-team@...a.com, dan.j.williams@...el.com,
	vishal.l.verma@...el.com, dave.jiang@...el.com, mst@...hat.com,
	jasowang@...hat.com, xuanzhuo@...ux.alibaba.com,
	eperezma@...hat.com, osalvador@...e.de, akpm@...ux-foundation.org
Subject: Re: [PATCH 3/8] mm/memory_hotplug: add APIs for explicit online type
 control

On Fri, Jan 23, 2026 at 06:25:26PM +0000, Jonathan Cameron wrote:
> On Thu, 22 Jan 2026 19:34:10 -0500
> Gregory Price <gourry@...rry.net> wrote:
> 
> > On Thu, Jan 22, 2026 at 11:41:24PM +0100, David Hildenbrand (Red Hat) wrote:
> > > 
> > > Right, but I don't want any other OOT kernel module to be able to make use
> > > of add_memory_driver_managed() to do arbitrary things, because we don't know
> > > if it's really user space setting the policy for that memory then.
> > >   
> > 
> > Ah, this was lost on me.
> > 
> > > So either restrict add_memory_driver_managed() to kmem+virtio_mem
> > > completely, or add another variant that will be kmem-only (or however that
> > > dax/cxl module is called).  
> > 
> > unclear to me how to restrict a function to specific drivers, but i can
> > add add_and_online_memory_driver_managed() trivially so no big issue.
> 
> Is EXPORT_SYMBOL_GPL_FOR_MODULE() enough?
> 

Is the issue just that add_memory_driver_manage is `extern`?  If so
yeah, i can just do the EXPORT_*_GPL path.

If you prefer FOR_MODULE, then yes I can do this.

~Gregory