Re: [PATCH v2 0/6] UIO driver for APM X-Gene QMTM

From: Ankit Jindal
Date: Thu Oct 09 2014 - 08:30:56 EST

On 9 October 2014 17:52, Richard Weinberger
<richard.weinberger@xxxxxxxxx> wrote:
> On Thu, Oct 9, 2014 at 2:17 PM, Ankit Jindal <ankit.jindal@xxxxxxxxxx> wrote:
>> On 9 October 2014 17:36, Arnd Bergmann <arnd@xxxxxxxx> wrote:
>>> On Thursday 09 October 2014 14:14:33 Ankit Jindal wrote:
>>>> On 30 September 2014 09:56, Ankit Jindal <ankit.jindal@xxxxxxxxxx> wrote:
>>>> > This patchset enables user space access to APM X-Gene QMTM
>>>> > using UIO framework.
>>>> >
>>>> > The patchset also introduces new type UIO_MEM_PHYS_CACHE
>>>> > for mem regions because APM X-Gene QMTM device supports
>>>> > cache coherency with CPU caches.
>>> I haven't been able to review the patch in detail yet, but I have
>>> a very high-level question: how do you decide which driver to use?
>>> I understand that the normal use case is for the QMTM to be used by
>>> the kernel directly rather than being exported to user space, and
>>> that the network driver will just use it if it is there.
>> This UIO driver will be disabled by default. When this driver is
>> enabled, the other dependent drivers need to be removed from the
>> config.
> And if the user forgets or creates an allmod/yesconfig we have
> undefined behavior?

When the conflicting drivers will be added to kernel, necessary
options (depends on not) needs to be added to the Kconfig.

> --
> Thanks,
> //richard

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