linux-kernel - Re: [PATCH v2] xen/gntdev: Use mempolicy instead of VM

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Date:   Thu, 17 Nov 2016 17:01:40 +0100
From:   Olaf Hering <olaf@...fle.de>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     david.vrabel@...rix.com, jgross@...e.com,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] xen/gntdev: Use mempolicy instead of VM_IO flag to
 avoid NUMA balancing

On Thu, Nov 17, Boris Ostrovsky wrote:

> On 11/17/2016 06:28 AM, Olaf Hering wrote:
> > ERROR: "__mpol_dup" [drivers/xen/xen-gntdev.ko] undefined!
> > ERROR: "get_task_policy" [drivers/xen/xen-gntdev.ko] undefined!
> I just built 4.4.11 with this patch applied and haven't had any problems.

Are these functions exported? How would the driver module call into the
core kernel? Maybe the added functionality should be provided by an
exported helper function.

Olaf

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