linux-kernel - Re: [PATCH] clk: sunxi: Fix operator precedence in sunxi_divs_clk

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Date:   Tue, 29 Oct 2019 08:43:08 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Emilio López <emilio@...pez.com.ar>,
        Chen-Yu Tsai <wens@...e.org>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] clk: sunxi: Fix operator precedence in
 sunxi_divs_clk_setup

On Tue, Oct 22, 2019 at 09:50:54AM -0700, Nathan Chancellor wrote:
> r375326 in Clang exposes an issue with operator precedence in
> sunxi_div_clk_setup:
>
> drivers/clk/sunxi/clk-sunxi.c:1083:30: warning: operator '?:' has lower
> precedence than '|'; '|' will be evaluated first
> [-Wbitwise-conditional-parentheses]
>                                                  data->div[i].critical ?
>                                                  ~~~~~~~~~~~~~~~~~~~~~ ^
> drivers/clk/sunxi/clk-sunxi.c:1083:30: note: place parentheses around
> the '|' expression to silence this warning
>                                                  data->div[i].critical ?
>                                                                        ^
>                                                                       )
> drivers/clk/sunxi/clk-sunxi.c:1083:30: note: place parentheses around
> the '?:' expression to evaluate it first
>                                                  data->div[i].critical ?
>                                                                        ^
>                                                  (
> 1 warning generated.
>
> It appears that the intention was for ?: to be evaluated first so that
> CLK_IS_CRITICAL could be added to clkflags if the critical boolean was
> set; right now, | is being evaluated first. Add parentheses around the
> ?: block to have it be evaluated first.
>
> Fixes: 9919d44ff297 ("clk: sunxi: Use CLK_IS_CRITICAL flag for critical clks")
> Link: https://github.com/ClangBuiltLinux/linux/issues/745
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Applied, thanks!
Maxime

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