linux-kernel - Re: [PATCH 1/5] thermal: Initialize thermal subsystem earlier

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Message-ID: <CAP245DVOX_x0e-CAzzG2cdpBeMdk=J7Tbgx4hpLXEavQwjRRAg@mail.gmail.com>
Date:   Tue, 17 Sep 2019 14:48:45 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Eduardo Valentin <edubezval@...il.com>,
        Andy Gross <agross@...nel.org>,
        Taniya Das <tdas@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Lina Iyer <ilina@...eaurora.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 1/5] thermal: Initialize thermal subsystem earlier

On Tue, Sep 17, 2019 at 1:30 AM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
> On 12/09/2019 00:32, Amit Kucheria wrote:
> > From: Lina Iyer <ilina@...eaurora.org>
> >
> > Now that the thermal framework is built-in, in order to facilitate
> > thermal mitigation as early as possible in the boot cycle, move the
> > thermal framework initialization to core_initcall.
> >
> > However, netlink initialization happens only as part of subsys_initcall.
> > At this time in the boot process, the userspace is not available yet. So
> > initialize the netlink events later in fs_initcall.
>
> Why not kill directly the netlink part, no one is using it in the kernel?

That's a good point. I wasn't sure if anybody was using it, but I can
remove it completely since no driver seems to be using the
thermal_generate_netlink_event() api.

Regards,
Amit

$ git grep thermal_generate_netlink_event
Documentation/thermal/sysfs-api.rst:just need to call
thermal_generate_netlink_event() with two arguments viz
drivers/thermal/thermal_core.c:int
thermal_generate_netlink_event(struct thermal_zone_device *tz,
drivers/thermal/thermal_core.c:EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
include/linux/thermal.h:extern int
thermal_generate_netlink_event(struct thermal_zone_device *tz,
include/linux/thermal.h:static inline int
thermal_generate_netlink_event(struct thermal_zone_device *tz,