Subject: Re: linux-next: Tree for Jul 7 (scsi/lpfc/lpfc_init.c)

From: James Smart <[email-masked]>
Date: Tue, 7 Jul 2020 11:12:00 -0700

On 7/7/2020 10:09 AM, Randy Dunlap wrote:
> On 7/7/20 1:08 AM, Stephen Rothwell wrote:
>> Hi all,
>>
>> Changes since 20200706:
>>
> on i386:
>
> when CONFIG_ACPI is not set/enabled:
>
>
> ../drivers/scsi/lpfc/lpfc_init.c:1265:15: error: implicit declaration of function 'get_cpu_idle_time'; did you mean 'get_cpu_device'? [-Werror=implicit-function-declaration]
>
>
> The cpufreq people want justification for using
> get_cpu_idle_time().  Please see
> https://lore.kernel.org/linux-scsi/20200707030943.xkocccy6qy2c3hrx@vireshk-i7/
>
>
>

The driver is using cpu utilization in order to choose between softirq 
or work queues in handling an interrupt. Less-utilized, softirq is used. 
higher utilized, work queue is used.  The utilization is checked 
periodically via a heartbeat.

-- james