linux-kernel - Re: [PATCH 2/2] drivers/dax/kmem: give a warning if CONFIG_DEV_DAX_PMEM

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Date:   Thu, 22 Aug 2019 19:10:35 +0000
From:   "Verma, Vishal L" <vishal.l.verma@...el.com>
To:     "justin.he@....com" <justin.he@....com>,
        "jmoyer@...hat.com" <jmoyer@...hat.com>
CC:     "Williams, Dan J" <dan.j.williams@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
Subject: Re: [PATCH 2/2] drivers/dax/kmem: give a warning if
 CONFIG_DEV_DAX_PMEM_COMPAT is enabled

On Thu, 2019-08-22 at 14:55 -0400, Jeff Moyer wrote:
> 
> When using daxctl to online memory, you already get the following
> message:
> 
> libdaxctl: daxctl_dev_disable: dax0.0: error: device model is dax-class
> 
> That's still not very helpful.  It would be better if the message
> suggested a fix (like using migrate-device-model).  Vishal?

Yes, it is on my list to improve this. Currently the man page shows the
above error message, and talks about migrate-device-model, but I
received more feedback to add another bread crumb in the printed message
pointing to migrate-device-model.  I'll send a patch for it soon.

Thanks,
	-Vishal