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* [PATCH] cpufreq: CPPC: Avoid overflow when calculating desired_perf
@ 2016-09-14 23:08 Hoan Tran
  2016-09-15  0:50 ` Rafael J. Wysocki
  0 siblings, 1 reply; 4+ messages in thread
From: Hoan Tran @ 2016-09-14 23:08 UTC (permalink / raw)
  To: Rafael J. Wysocki, Viresh Kumar, pprakash, Al Stone
  Cc: linux-pm, linux-kernel, lho, Duc Dang, Hoan Tran

This patch fixes overflow issue when calculating the desired_perf.

Signed-off-by: Hoan Tran <hotran@apm.com>
---
 drivers/cpufreq/cppc_cpufreq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index 894e465..3e0961e 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -84,7 +84,8 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
 
 	cpu = all_cpu_data[policy->cpu];
 
-	cpu->perf_ctrls.desired_perf = target_freq * policy->max / cppc_dmi_max_khz;
+	cpu->perf_ctrls.desired_perf =
+		(u64)target_freq * policy->max / cppc_dmi_max_khz;
 	freqs.old = policy->cur;
 	freqs.new = target_freq;
 
-- 
1.9.1

^ permalink raw reply related	[flat|nested] 4+ messages in thread

* Re: [PATCH] cpufreq: CPPC: Avoid overflow when calculating desired_perf
  2016-09-14 23:08 [PATCH] cpufreq: CPPC: Avoid overflow when calculating desired_perf Hoan Tran
@ 2016-09-15  0:50 ` Rafael J. Wysocki
  2016-09-15  3:06   ` Hoan Tran
  0 siblings, 1 reply; 4+ messages in thread
From: Rafael J. Wysocki @ 2016-09-15  0:50 UTC (permalink / raw)
  To: Hoan Tran
  Cc: Viresh Kumar, pprakash, Al Stone, linux-pm, linux-kernel, lho,
	Duc Dang

On Wednesday, September 14, 2016 04:08:28 PM Hoan Tran wrote:
> This patch fixes overflow issue when calculating the desired_perf.
> 
> Signed-off-by: Hoan Tran <hotran@apm.com>
> ---
>  drivers/cpufreq/cppc_cpufreq.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
> index 894e465..3e0961e 100644
> --- a/drivers/cpufreq/cppc_cpufreq.c
> +++ b/drivers/cpufreq/cppc_cpufreq.c
> @@ -84,7 +84,8 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
>  
>  	cpu = all_cpu_data[policy->cpu];
>  
> -	cpu->perf_ctrls.desired_perf = target_freq * policy->max / cppc_dmi_max_khz;
> +	cpu->perf_ctrls.desired_perf =
> +		(u64)target_freq * policy->max / cppc_dmi_max_khz;
>  	freqs.old = policy->cur;
>  	freqs.new = target_freq;

That's on top of the CPPC material in linux-next I gather?

Which commit does it fix?

Thanks,
Rafael

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] cpufreq: CPPC: Avoid overflow when calculating desired_perf
  2016-09-15  0:50 ` Rafael J. Wysocki
@ 2016-09-15  3:06   ` Hoan Tran
  2016-09-19 18:54     ` Al Stone
  0 siblings, 1 reply; 4+ messages in thread
From: Hoan Tran @ 2016-09-15  3:06 UTC (permalink / raw)
  To: Rafael J. Wysocki
  Cc: Viresh Kumar, Prashanth Prakash, Al Stone, linux-pm, lkml, Loc Ho,
	Duc Dang

Hi Rafael,

On Wed, Sep 14, 2016 at 5:50 PM, Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
> On Wednesday, September 14, 2016 04:08:28 PM Hoan Tran wrote:
>> This patch fixes overflow issue when calculating the desired_perf.
>>
>> Signed-off-by: Hoan Tran <hotran@apm.com>
>> ---
>>  drivers/cpufreq/cppc_cpufreq.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
>> index 894e465..3e0961e 100644
>> --- a/drivers/cpufreq/cppc_cpufreq.c
>> +++ b/drivers/cpufreq/cppc_cpufreq.c
>> @@ -84,7 +84,8 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
>>
>>       cpu = all_cpu_data[policy->cpu];
>>
>> -     cpu->perf_ctrls.desired_perf = target_freq * policy->max / cppc_dmi_max_khz;
>> +     cpu->perf_ctrls.desired_perf =
>> +             (u64)target_freq * policy->max / cppc_dmi_max_khz;
>>       freqs.old = policy->cur;
>>       freqs.new = target_freq;
>
> That's on top of the CPPC material in linux-next I gather?

Yes, it's on TOP of linux-next.

>
> Which commit does it fix?

This is a fix for ad38677df44b67e0f5b6c4d31e9c2734abde8ed9 (cpufreq:
CPPC: Force reporting values in KHz to fix user space interface)
http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/drivers/cpufreq/cppc_cpufreq.c?id=ad38677df44b67e0f5b6c4d31e9c2734abde8ed9

Thanks
Hoan

>
> Thanks,
> Rafael
>

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] cpufreq: CPPC: Avoid overflow when calculating desired_perf
  2016-09-15  3:06   ` Hoan Tran
@ 2016-09-19 18:54     ` Al Stone
  0 siblings, 0 replies; 4+ messages in thread
From: Al Stone @ 2016-09-19 18:54 UTC (permalink / raw)
  To: Hoan Tran, Rafael J. Wysocki
  Cc: Viresh Kumar, Prashanth Prakash, linux-pm, lkml, Loc Ho, Duc Dang

On 09/14/2016 09:06 PM, Hoan Tran wrote:
> Hi Rafael,
> 
> On Wed, Sep 14, 2016 at 5:50 PM, Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
>> On Wednesday, September 14, 2016 04:08:28 PM Hoan Tran wrote:
>>> This patch fixes overflow issue when calculating the desired_perf.
>>>
>>> Signed-off-by: Hoan Tran <hotran@apm.com>
>>> ---
>>>  drivers/cpufreq/cppc_cpufreq.c | 3 ++-
>>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
>>> index 894e465..3e0961e 100644
>>> --- a/drivers/cpufreq/cppc_cpufreq.c
>>> +++ b/drivers/cpufreq/cppc_cpufreq.c
>>> @@ -84,7 +84,8 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
>>>
>>>       cpu = all_cpu_data[policy->cpu];
>>>
>>> -     cpu->perf_ctrls.desired_perf = target_freq * policy->max / cppc_dmi_max_khz;
>>> +     cpu->perf_ctrls.desired_perf =
>>> +             (u64)target_freq * policy->max / cppc_dmi_max_khz;
>>>       freqs.old = policy->cur;
>>>       freqs.new = target_freq;
>>
>> That's on top of the CPPC material in linux-next I gather?
> 
> Yes, it's on TOP of linux-next.
> 
>>
>> Which commit does it fix?
> 
> This is a fix for ad38677df44b67e0f5b6c4d31e9c2734abde8ed9 (cpufreq:
> CPPC: Force reporting values in KHz to fix user space interface)
> http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/drivers/cpufreq/cppc_cpufreq.c?id=ad38677df44b67e0f5b6c4d31e9c2734abde8ed9
> 
> Thanks
> Hoan
> 
>>
>> Thanks,
>> Rafael
>>

Nice catch, Hoan.  Thanks!

-- 
ciao,
al
-----------------------------------
Al Stone
Software Engineer
Red Hat, Inc.
ahs3@redhat.com
-----------------------------------

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2016-09-19 18:54 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2016-09-14 23:08 [PATCH] cpufreq: CPPC: Avoid overflow when calculating desired_perf Hoan Tran
2016-09-15  0:50 ` Rafael J. Wysocki
2016-09-15  3:06   ` Hoan Tran
2016-09-19 18:54     ` Al Stone

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