linux-kernel - Re: [PATCH][next] clk: sunxi-ng: nkm: remove redundant initialization of tmp

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Date:   Mon, 23 Oct 2023 14:52:11 +0100
From:   Andre Przywara <andre.przywara@....com>
To:     Colin Ian King <colin.i.king@...il.com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH][next] clk: sunxi-ng: nkm: remove redundant
 initialization of tmp_parent

On Mon, 23 Oct 2023 14:35:02 +0100
Colin Ian King <colin.i.king@...il.com> wrote:

Hi,

> Variable tmp_parent is being ininitialized with a value that is never
> read, the initialization is redundant and can be removed. Move the
> initialization and move the variable to the inner loop scope.
> 
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>

Yes, that seems to be correct:

Reviewed-by: Andre Przywara <andre.przywara@....com>

Cheers,
Andre

> ---
>  drivers/clk/sunxi-ng/ccu_nkm.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
> index eed64547ad42..853f84398e2b 100644
> --- a/drivers/clk/sunxi-ng/ccu_nkm.c
> +++ b/drivers/clk/sunxi-ng/ccu_nkm.c
> @@ -21,17 +21,16 @@ static unsigned long ccu_nkm_find_best_with_parent_adj(struct ccu_common *common
>  						       unsigned long *parent, unsigned long rate,
>  						       struct _ccu_nkm *nkm)
>  {
> -	unsigned long best_rate = 0, best_parent_rate = *parent, tmp_parent = *parent;
> +	unsigned long best_rate = 0, best_parent_rate = *parent;
>  	unsigned long best_n = 0, best_k = 0, best_m = 0;
>  	unsigned long _n, _k, _m;
>  
>  	for (_k = nkm->min_k; _k <= nkm->max_k; _k++) {
>  		for (_n = nkm->min_n; _n <= nkm->max_n; _n++) {
>  			for (_m = nkm->min_m; _m <= nkm->max_m; _m++) {
> -				unsigned long tmp_rate;
> +				unsigned long tmp_rate, tmp_parent;
>  
>  				tmp_parent = clk_hw_round_rate(parent_hw, rate * _m / (_n * _k));
> -
>  				tmp_rate = tmp_parent * _n * _k / _m;
>  
>  				if (ccu_is_better_rate(common, rate, tmp_rate, best_rate) ||