linux-kernel - Re: [PATCH -next] clk: pm_clock: provide stubs for pm_clk_runtime_suspend/

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Date:   Fri, 6 Nov 2020 15:41:51 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        linux-pm@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
        Taniya Das <tdas@...eaurora.org>, linux-next@...r.kernel.org
Subject: Re: [PATCH -next] clk: pm_clock: provide stubs for
 pm_clk_runtime_suspend/_resume

On Fri, Nov 06, 2020 at 11:17:13AM -0700, Nathan Chancellor wrote:
> On Fri, Nov 06, 2020 at 10:05:44AM -0800, Randy Dunlap wrote:
> > Add stubs for pm_clk_runtime_suspend() and pm_clk_runtime_resume()
> > to fix build errors when CONFIG_PM and CONFIG_PM_CLK are not enabled.
> > 
> > Fixes these build errors:
> > 
> > ../drivers/clk/qcom/camcc-sc7180.c: In function ‘cam_cc_sc7180_probe’:
> > ../drivers/clk/qcom/camcc-sc7180.c:1672:8: error: implicit declaration of function ‘pm_clk_runtime_resume’; did you mean ‘pm_runtime_resume’? [-Werror=implicit-function-declaration]
> >   ret = pm_clk_runtime_resume(&pdev->dev);
> >         ^~~~~~~~~~~~~~~~~~~~~
> > ../drivers/clk/qcom/camcc-sc7180.c:1681:3: error: implicit declaration of function ‘pm_clk_runtime_suspend’; did you mean ‘pm_runtime_suspend’? [-Werror=implicit-function-declaration]
> >    pm_clk_runtime_suspend(&pdev->dev);
> >    ^~~~~~~~~~~~~~~~~~~~~~
> > 
> > Fixes: 15d09e830bbc ("clk: qcom: camcc: Add camera clock controller driver for SC7180")
> > Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> > Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> > Cc: Len Brown <len.brown@...el.com>
> > Cc: Pavel Machek <pavel@....cz>
> > Cc: linux-pm@...r.kernel.org
> > Cc: Michael Turquette <mturquette@...libre.com>
> > Cc: Stephen Boyd <sboyd@...nel.org>
> > Cc: linux-clk@...r.kernel.org
> > Cc: Taniya Das <tdas@...eaurora.org>
> > Cc: linux-next@...r.kernel.org
> 
> This fixes the same build failure that I saw with s390 all{mod,yes}config.
> 
> Build-tested-by: Nathan Chancellor <natechancellor@...il.com>
> Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

Actually, this breaks certain powerpc configs:

$ make -skj"$(nproc)" ARCH=powerpc CROSS_COMPILE=powerpc-linux- distclean ppc44x_defconfig drivers/base/power/common.o
In file included from drivers/base/power/common.c:11:
./include/linux/pm_clock.h:87:19: error: static declaration of 'pm_clk_runtime_suspend' follows non-static declaration
   87 | static inline int pm_clk_runtime_suspend(struct device *dev)
      |                   ^~~~~~~~~~~~~~~~~~~~~~
./include/linux/pm_clock.h:23:12: note: previous declaration of 'pm_clk_runtime_suspend' was here
   23 | extern int pm_clk_runtime_suspend(struct device *dev);
      |            ^~~~~~~~~~~~~~~~~~~~~~
./include/linux/pm_clock.h:91:19: error: static declaration of 'pm_clk_runtime_resume' follows non-static declaration
   91 | static inline int pm_clk_runtime_resume(struct device *dev)
      |                   ^~~~~~~~~~~~~~~~~~~~~
./include/linux/pm_clock.h:24:12: note: previous declaration of 'pm_clk_runtime_resume' was here
   24 | extern int pm_clk_runtime_resume(struct device *dev);
      |            ^~~~~~~~~~~~~~~~~~~~~
make[4]: *** [scripts/Makefile.build:283: drivers/base/power/common.o] Error 1
make[4]: Target '__build' not remade because of errors.
make[3]: *** [scripts/Makefile.build:500: drivers/base/power] Error 2
make[3]: Target '__build' not remade because of errors.
make[2]: *** [scripts/Makefile.build:500: drivers/base] Error 2
make[2]: Target '__build' not remade because of errors.
make[1]: *** [Makefile:1797: drivers] Error 2
make[1]: Target 'drivers/base/power/common.o' not remade because of errors.
make: *** [Makefile:335: __build_one_by_one] Error 2
make: Target 'distclean' not remade because of errors.
make: Target 'ppc44x_defconfig' not remade because of errors.
make: Target 'drivers/base/power/common.o' not remade because of errors.

I think this should be moved into the CONFIG_PM block at the top of the
file.

> > ---
> >  include/linux/pm_clock.h |    9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > --- linux-next-20201106.orig/include/linux/pm_clock.h
> > +++ linux-next-20201106/include/linux/pm_clock.h
> > @@ -83,6 +83,15 @@ static inline void pm_clk_remove(struct
> >  static inline void pm_clk_remove_clk(struct device *dev, struct clk *clk)
> >  {
> >  }
> > +
> > +static inline int pm_clk_runtime_suspend(struct device *dev)
> > +{
> > +	return 0;
> > +}
> > +static inline int pm_clk_runtime_resume(struct device *dev)
> > +{
> > +	return 0;
> > +}
> >  #endif
> >  
> >  #ifdef CONFIG_HAVE_CLK