Hi,
在 2025/8/27 17:12, Ben Horgan 写道:
> Hi Zihuan,
>
> On 8/27/25 09:55, Zihuan Zhang wrote:
>> Hi,
>>
>> 在 2025/8/27 16:30, Ben Horgan 写道:
>>> Hi Zihuan,
>>>
>>> On 8/27/25 03:31, Zihuan Zhang wrote:
>>>> Replace the manual cpufreq_cpu_put() with __free(put_cpufreq_policy)
>>>> annotation for policy references. This reduces the risk of reference
>>>> counting mistakes and aligns the code with the latest kernel style.
>>>>
>>>> No functional change intended.
>>>>
>>>> Signed-off-by: Zihuan Zhang <zhangzihuan@kylinos.cn>
>>>> ---
>>>> arch/arm64/kernel/topology.c | 9 +++------
>>>> 1 file changed, 3 insertions(+), 6 deletions(-)
>>>>
>>>> diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
>>>> index 5d07ee85bdae..e3cb6d54f35b 100644
>>>> --- a/arch/arm64/kernel/topology.c
>>>> +++ b/arch/arm64/kernel/topology.c
>>>> @@ -307,17 +307,16 @@ int arch_freq_get_on_cpu(int cpu)
>>>> */
>>>> if (!housekeeping_cpu(cpu, HK_TYPE_TICK) ||
>>>> time_is_before_jiffies(last_update +
>>>> msecs_to_jiffies(AMU_SAMPLE_EXP_MS))) {
>>>> - struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
>>>> + struct cpufreq_policy *policy __free(put_cpufreq_policy);
>>> Based on the guidance, in include/linux/cleanup.h, I would expect the
>>> assignment to be done on this line.
>>>
>>> "...the recommendation is to always define and assign variables in one
>>> * statement and not group variable definitions at the top of the
>>> * function when __free() is used."
>>
>> The reason I split the assignment into multiple lines is because
>> scripts/checkpatch.pl gave a warning about the line being too long.
>>
>> But if you think a single-line assignment is better, I will modify it
>> accordingly.
> My preference, for what it's worth, would be to keep it one statement
> and split the line after the =.
Okay, I will update it that way. Thanks.
>>>> int ref_cpu;
>>>> + policy = cpufreq_cpu_get(cpu);
>>>> if (!policy)
>>>> return -EINVAL;
>>>> if (!cpumask_intersects(policy->related_cpus,
>>>> - housekeeping_cpumask(HK_TYPE_TICK))) {
>>>> - cpufreq_cpu_put(policy);
>>>> + housekeeping_cpumask(HK_TYPE_TICK)))
>>>> return -EOPNOTSUPP;
>>>> - }
>>>> for_each_cpu_wrap(ref_cpu, policy->cpus, cpu + 1) {
>>>> if (ref_cpu == start_cpu) {
>>>> @@ -329,8 +328,6 @@ int arch_freq_get_on_cpu(int cpu)
>>>> break;
>>>> }
>>>> - cpufreq_cpu_put(policy);
>>>> -
>>>> if (ref_cpu >= nr_cpu_ids)
>>>> /* No alternative to pull info from */
>>>> return -EAGAIN;
>>> Thanks,
>>>
>>> Ben
>>>
> Thanks,
>
> Ben
>