Re: [PATCH] cpufreq: conservative: fix requested_freq reduction issue

From: Viresh Kumar
Date: Thu Nov 07 2013 - 00:09:50 EST

On 7 November 2013 07:58, Xiaoguang Chen <chenxg@xxxxxxxxxxx> wrote:
> When decreasing frequency, requested_freq may be less than
> freq_target, So requested_freq minus freq_target may be negative,
> But reqested_freq's unit is unsigned int, then the negative result
> will be one larger interger which may be even higher than
> requested_freq.
> This patch is to fix such issue. when result becomes negative,
> set requested_freq as the min value of policy.
> Signed-off-by: Xiaoguang Chen <chenxg@xxxxxxxxxxx>
> ---
> drivers/cpufreq/cpufreq_conservative.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)

Good Catch.

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

We need another patch for fixing the other part of code where we
increase freq..
We need to replace:

if (dbs_info->requested_freq == policy->max)


if (dbs_info->requested_freq >= policy->max)

So, that we don't run unnecessary code :)
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at