linux-kernel - Re: [PATCH] cpufreq: fix sign check of an unsigned variable in cpufreq-cpu0

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Message-ID: <CAOh2x=n-G0BwhjH+VXgy=+nbsaH0+5FqWHhDoyU=xWp-EH9Zdg@mail.gmail.com>
Date:	Mon, 25 Feb 2013 17:39:47 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Mike Turquette <mturquette@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, cpufreq@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: fix sign check of an unsigned variable in cpufreq-cpu0

On Mon, Feb 25, 2013 at 5:02 PM, Guennadi Liakhovetski
<g.liakhovetski@....de> wrote:
> A "< 0" test for an unsigned variable is meaningless, change the variable
> to signed.
>
> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
> ---
>
> stable?
>
>  drivers/cpufreq/cpufreq-cpu0.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c
> index 52bf36d..e7bad3c 100644
> --- a/drivers/cpufreq/cpufreq-cpu0.c
> +++ b/drivers/cpufreq/cpufreq-cpu0.c
> @@ -44,7 +44,8 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
>  {
>         struct cpufreq_freqs freqs;
>         struct opp *opp;
> -       unsigned long freq_Hz, volt = 0, volt_old = 0, tol = 0;
> +       unsigned long volt = 0, volt_old = 0, tol = 0;
> +       long freq_Hz;

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

The disease is spread across a bigger region though.

@Mike: clk_round_rate returns long and __clk_round_rate returns unsigned long
and clk_ops->round_rate returns long again.. Don't you see something
strange here?
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