linux-kernel - Re: [PATCH V2 4/6] PM / domain: Register for PM QOS performance notifier

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Date:   Tue, 21 Feb 2017 16:28:13 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Kevin Hilman <khilman@...libre.com>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        linaro-kernel <linaro-kernel@...ts.linaro.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Lina Iyer <lina.iyer@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: Re: [PATCH V2 4/6] PM / domain: Register for PM QOS performance notifier

[...]

>
>> > +   /* Propagate only if this domain has a single parent */
>>
>> Why?  This limitation should be explained in the cover letter and
>> changelog.  I would also expect some sort of WARN here since this could
>> otherwise be a rather silent failures.
>
> I think this limitation can just be removed, but I am confused a bit.
>
> I thought that support for multiple parent domains isn't yet there,
> isn't it? And that few people are trying to add it in kernel and the
> stuff is still under review. Like this thread:

A genpd PM domain can have several parents (or to use the genpd
terminology, masters).

This is different from allowing a device to be attached to more than
one PM domains, which is what I think you are referring to. That isn't
supported.

>
> https://lkml.org/lkml/2016/11/22/792
>
> --
> viresh

Kind regards
Uffe