linux-kernel - Re: [PATCH -next 2/3] clk: stm32: core: Fix unsigned comparison with less than zero

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Date:   Wed, 14 Jun 2023 12:57:05 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Yang Li <yang.lee@...ux.alibaba.com>
Cc:     mturquette@...libre.com, orsonzhai@...il.com,
        baolin.wang@...ux.alibaba.com, zhang.lyra@...il.com,
        pdeschrijver@...dia.com, pgaikwad@...dia.com,
        thierry.reding@...il.com, jonathanh@...dia.com,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yang Li <yang.lee@...ux.alibaba.com>,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: Re: [PATCH -next 2/3] clk: stm32: core: Fix unsigned comparison with less than zero

Quoting Yang Li (2023-06-13 18:29:12)
> The return value of the divider_ro_round_rate() is long.
> However, the return value is being assigned to an unsigned
> long variable 'rate', so making 'rate' to long.
> 
> silence the warnings:
> ./drivers/clk/stm32/clk-stm32-core.c:451:6-10: WARNING: Unsigned expression compared with zero: rate < 0
> ./drivers/clk/stm32/clk-stm32-core.c:461:5-9: WARNING: Unsigned expression compared with zero: rate < 0
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5519
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
> ---
>  drivers/clk/stm32/clk-stm32-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/stm32/clk-stm32-core.c b/drivers/clk/stm32/clk-stm32-core.c
> index d5aa09e9fce4..067b918a8894 100644
> --- a/drivers/clk/stm32/clk-stm32-core.c
> +++ b/drivers/clk/stm32/clk-stm32-core.c
> @@ -431,7 +431,7 @@ static int clk_stm32_composite_determine_rate(struct clk_hw *hw,
>  {
>         struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
>         const struct stm32_div_cfg *divider;
> -       unsigned long rate;
> +       long rate;
>  

Instead of this can you convert this code to use
divider_ro_determine_rate() and divider_determine_rate()?