linux-kernel - Re: [PATCH] clk: define to_clk

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Date:   Wed, 28 Oct 2020 16:34:50 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Andy Gross <agross@...nel.org>, Arnd Bergmann <arnd@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Mike Turquette <mturquette@...aro.org>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Stephen Boyd <sboyd@...eaurora.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] clk: define to_clk_regmap() as inline function

Quoting Arnd Bergmann (2020-10-26 09:13:57)
> From: Arnd Bergmann <arnd@...db.de>
> 
> Nesting container_of() causes warnings with W=2, which is
> annoying if it happens in headers and fills the build log
> like:
> 
> In file included from drivers/clk/qcom/clk-alpha-pll.c:6:
> drivers/clk/qcom/clk-alpha-pll.c: In function 'clk_alpha_pll_hwfsm_enable':
> include/linux/kernel.h:852:8: warning: declaration of '__mptr' shadows a previous local [-Wshadow]
>   852 |  void *__mptr = (void *)(ptr);     \
>       |        ^~~~~~
> drivers/clk/qcom/clk-alpha-pll.c:155:31: note: in expansion of macro 'container_of'
>   155 | #define to_clk_alpha_pll(_hw) container_of(to_clk_regmap(_hw), \
>       |                               ^~~~~~~~~~~~
> drivers/clk/qcom/clk-regmap.h:27:28: note: in expansion of macro 'container_of'
>    27 | #define to_clk_regmap(_hw) container_of(_hw, struct clk_regmap, hw)
>       |                            ^~~~~~~~~~~~
> drivers/clk/qcom/clk-alpha-pll.c:155:44: note: in expansion of macro 'to_clk_regmap'
>   155 | #define to_clk_alpha_pll(_hw) container_of(to_clk_regmap(_hw), \
>       |                                            ^~~~~~~~~~~~~
> drivers/clk/qcom/clk-alpha-pll.c:254:30: note: in expansion of macro 'to_clk_alpha_pll'
>   254 |  struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
>       |                              ^~~~~~~~~~~~~~~~
> include/linux/kernel.h:852:8: note: shadowed declaration is here
>   852 |  void *__mptr = (void *)(ptr);     \
>       |        ^~~~~~
> 
> Redefine two copies of the to_clk_regmap() macro as inline functions
> to avoid a lot of these.
> 
> Fixes: ea11dda9e091 ("clk: meson: add regmap clocks")
> Fixes: 085d7a455444 ("clk: qcom: Add a regmap type clock struct")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Applied to clk-fixes