netdev - Re: [PATCH iproute2] tc: fix warning in q

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Date:   Wed, 27 Nov 2019 08:26:55 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Brian Vazquez <brianvv@...gle.com>
Cc:     Brian Vazquez <brianvv.kernel@...il.com>,
        David Ahern <dsahern@...il.com>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Maciej Zenczykowski <maze@...gle.com>, netdev@...r.kernel.org,
        Leslie Monis <lesliemonis@...il.com>
Subject: Re: [PATCH iproute2] tc: fix warning in q_pie.c

On Tue, 26 Nov 2019 21:20:59 -0800
Brian Vazquez <brianvv@...gle.com> wrote:

> Warning was:
> q_pie.c:202:22: error: implicit conversion from 'unsigned long' to
> 'double'
> 
> Fixes: 492ec9558b30 ("tc: pie: change maximum integer value of tc_pie_xstats->prob")
> Cc: Leslie Monis <lesliemonis@...il.com>
> Signed-off-by: Brian Vazquez <brianvv@...gle.com>
> ---
>  tc/q_pie.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tc/q_pie.c b/tc/q_pie.c
> index 40982f96..52ba7256 100644
> --- a/tc/q_pie.c
> +++ b/tc/q_pie.c
> @@ -199,7 +199,7 @@ static int pie_print_xstats(struct qdisc_util *qu, FILE *f,
>  	st = RTA_DATA(xstats);
>  	/*prob is returned as a fracion of maximum integer value */
>  	fprintf(f, "prob %f delay %uus avg_dq_rate %u\n",
> -		(double)st->prob / UINT64_MAX, st->delay,
> +		(double)st->prob / (double)UINT64_MAX, st->delay,
>  		st->avg_dq_rate);
>  	fprintf(f, "pkts_in %u overlimit %u dropped %u maxq %u ecn_mark %u\n",
>  		st->packets_in, st->overlimit, st->dropped, st->maxq,

What compiler is this?
The type seems correct already.  The type of double / unsigned long is double.
And the conversion may give different answer.