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

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Message-ID: <057d38c5-4e1a-21dd-c51d-010b1dfdc752@oracle.com>
Date:   Thu, 17 Nov 2016 11:09:22 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Olaf Hering <olaf@...fle.de>
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 11/17/2016 11:01 AM, Olaf Hering wrote:
> 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.

You are right --- I didn't realize was building with grant device
built-in. So yes, this needs to be fixed.

-boris



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