linux-kernel - Re: [PATCH v2] PM / clk: make PM clock layer compatible with clocks that must sleep

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Message-ID: <66o22n46-n7p6-3p8r-3ssp-rs8oo28n87nq@syhkavp.arg>
Date:   Fri, 22 Jan 2021 10:52:18 -0500 (EST)
From:   Nicolas Pitre <nico@...xnic.net>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Linux PM <linux-pm@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2] PM / clk: make PM clock layer compatible with clocks
 that must sleep

On Fri, 22 Jan 2021, Rafael J. Wysocki wrote:

> > > +/**
> > > + * pm_clk_list_unlock - counterpart to pm_clk_list_lock().
> > > + * @psd: the same pm_subsys_data instance previously passed to
> > > + *      pm_clk_list_lock().
> > > + */
> > > +static void pm_clk_list_unlock(struct pm_subsys_data *psd)
> 
> Locking annotations for sparse were missing here and above, so I've
> added them by hand.

Thanks.

> Please double check the result in my linux-next branch (just pushed).

There are still the following warnings:

drivers/base/power/clock_ops.c:52:13: warning: context imbalance in 'pm_clk_list_lock' - wrong count at exit
drivers/base/power/clock_ops.c:64:13: warning: context imbalance in 'pm_clk_list_unlock' - wrong count at exit

I guess this can be silenced (still need to investigate how those 
annotations work).

But I'm more worried about these:

drivers/base/power/clock_ops.c:86:12: warning: context imbalance in 'pm_clk_op_lock' - different lock contexts for basic block
drivers/base/power/clock_ops.c:131:39: warning: context imbalance in 'pm_clk_op_unlock' - unexpected unlock

Those are special locking helpers indeed and I don't know if that can be 
dealt with.


Nicolas