linux-kernel - Re: [PATCH v2] clk: Provide notifier stubs when !COMMON

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Date:	Tue, 28 Jun 2016 17:14:49 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Russell King <linux@...linux.org.uk>, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Michael Turquette <mturquette@...libre.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-pm@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v2] clk: Provide notifier stubs when !COMMON_CLK

On 06/28, Krzysztof Kozlowski wrote:
> On Tue, Jun 28, 2016 at 10:26:53AM -0700, Stephen Boyd wrote:
> > On 06/28, Krzysztof Kozlowski wrote:
> > > The clk notifier symbols are hidden by COMMON_CLK.  However on some
> > > platforms HAVE_CLK might be set while COMMON_CLK not which leads to
> > > compile test build errors like:
> > > 
> > > $ make.cross ARCH=sh
> > >    drivers/devfreq/tegra-devfreq.c: In function 'tegra_actmon_rate_notify_cb':
> > > >> drivers/devfreq/tegra-devfreq.c:391:16: error: 'POST_RATE_CHANGE' undeclared (first use in this function)
> > >      if (action != POST_RATE_CHANGE)
> > >                    ^
> > >    drivers/devfreq/tegra-devfreq.c: In function 'tegra_devfreq_probe':
> > > >> drivers/devfreq/tegra-devfreq.c:654:8: error: implicit declaration of function 'clk_notifier_register' [-Werror=implicit-function-declaration]
> > >      err = clk_notifier_register(tegra->emc_clock, &tegra->rate_change_nb);
> > >            ^
> > > 
> > > Export the macros and data type declarations outside of COMMON_CLK ifdef
> > > and provide stubs to fix the compile testing.
> > > 
> > > Reported-by: kbuild test robot <lkp@...el.com>
> > > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> > > 
> > > ---
> > > 
> > 
> > Ok. Did you want some stable branch to pull this in and base your
> > use case on?
> 
> It is only one patch but indeed without the branch my patches would have
> to wait for next release. If you would be so kind, could you prepare
> the stable branch? I hope MyungJoo Ham will use it.
> 
> Anyway I encountered more linkage errors for clk API (like clk_get_rate()).
> They happen for various compile-tested drivers in case of MIPS (and
> maybe others like SH). I will investigate it more but I think it is not
> related strictly to this issue.

Sure. That's probably because some clk APIs are optional and not
implemented, leading to link errors.

I've applied this patch to a branch called clk-notify and merged
it into clk-next.

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