linux-kernel - Re: [PATCH v0 01/11] stm class: Introduce an abstraction for System Trace Module devices

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Date:	Fri, 20 Mar 2015 09:19:31 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pratik Patel <pratikp@...eaurora.org>, peter.lachner@...el.com,
	norbert.schulz@...el.com, keven.boell@...el.com,
	yann.fouassier@...el.com, laurent.fert@...el.com,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v0 01/11] stm class: Introduce an abstraction for System
 Trace Module devices

On 20 March 2015 at 08:53, Alexander Shishkin
<alexander.shishkin@...ux.intel.com> wrote:
> Mathieu Poirier <mathieu.poirier@...aro.org> writes:
>
>> As promised I worked on a prototype that connects the coresight-stm
>> driver with the generic STM interface you have suggested.  Things work
>> quite well and aside from the enhancement related to the ioctl() and
>> private member as discussed above, we should move ahead with this.
>>
>> I will send out a new version of the coresight-stm driver as soon as I
>> see your patches with those changes.
>
> Actually, instread of a private member I'd simply pass struct stm_data
> pointer to the callback (like we do with other callbacks) and the
> private data would be in the structure that embeds this struct stm_data,
> so that you can get to it using container_of():
>
> struct my_stm {
>        struct stm_data  data;
>        void             *my_stuff;
>        ...
> };
>
> ...
>
> long my_ioctl(struct stm_data *data, unsigned int cmd, unsigned long
>               arg)
> {
>         struct my_stm *mine = container_of(data, struct my_stm, data);
>
> ...
>
> Would this work for you?

That should be just fine yes.

> I'm otherwise ready to send the second version
> of my patchset.

Cool

>
> Regards,
> --
> Alex
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