linux-kernel - Re: [PATCH V2] cpufreq: scmi: Avoid overflow of target

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Date: Fri, 31 May 2024 08:50:30 +0530
From: Jagadeesh Kona <quic_jkona@...cinc.com>
To: Viresh Kumar <viresh.kumar@...aro.org>
CC: Sudeep Holla <sudeep.holla@....com>,
        "Rafael J . Wysocki"
	<rafael@...nel.org>,
        Cristian Marussi <cristian.marussi@....com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Taniya Das <quic_tdas@...cinc.com>,
        "Ajit
 Pandey" <quic_ajipan@...cinc.com>,
        Imran Shaik <quic_imrashai@...cinc.com>,
        Vivek Aknurwar <quic_viveka@...cinc.com>,
        Mike Tipton
	<quic_mdtipton@...cinc.com>
Subject: Re: [PATCH V2] cpufreq: scmi: Avoid overflow of target_freq in fast
 switch



On 5/28/2024 9:33 AM, Viresh Kumar wrote:
> On 27-05-24, 15:26, Jagadeesh Kona wrote:
>>
>>
>> On 5/20/2024 2:17 PM, Viresh Kumar wrote:
>>> On 20-05-24, 12:07, Jagadeesh Kona wrote:
>>>> Conversion of target_freq to HZ in scmi_cpufreq_fast_switch()
>>>> can lead to overflow if the multiplied result is greater than
>>>> UINT_MAX, since type of target_freq is unsigned int. Avoid this
>>>> overflow by assigning target_freq to unsigned long variable for
>>>> converting it to HZ.
>>>>
>>>> Signed-off-by: Jagadeesh Kona <quic_jkona@...cinc.com>
>>>> ---
>>>> Changes in V2:
>>>>     - Updated freq variable from u64 to unsigned long to keep it
>>>>       consistent with the rate parameter in scmi .freq_set() callback
>>>>     - Link to v1: https://lore.kernel.org/all/20240517070157.19553-1-quic_jkona@quicinc.com/
>>>> ---
>>>>    drivers/cpufreq/scmi-cpufreq.c | 4 ++--
>>>>    1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> Applied. Thanks.
>>>
>>
>> Thanks Viresh for the offline update on applying this patch to cpufreq arm
>> tree. Please help share the git tree details of the same, since we need them
>> to pick this change in Google ACK and downstream tree.
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git cpufreq/arm/linux-next
> 
> I have pushed it out now, it will be there in linux-next soon. My
> branch is not fixed, I may end up rebasing it. Ideally, you shouldn't
> backport anything to android unless it end ups in Linus's tree, only
> then the sha id will be fixed and guaranteed not to change.
> 

Thanks Viresh!