Re: [PATCH v3 1/4] irq: export kstat_irqs

[Jerry Snitselaar <jsnitsel@redhat.com>]

Thomas Gleixner @ 2020-12-06 10:54 MST:

> Jerry,
>
> On Fri, Dec 04 2020 at 18:43, Jerry Snitselaar wrote:
>
> The proper prefix is 'genirq:' git log kernel/irq/irqdesc.c would have
> told you. 
>
>> To try and detect potential interrupt storms that
>> have been occurring with tpm_tis devices it was suggested
>> to use kstat_irqs() to get the number of interrupts.
>> Since tpm_tis can be built as a module it needs kstat_irqs
>> exported.
>
> I'm not really enthused about exporting this without making it at least
> safe. Using it from an interrupt handler is obviously safe vs. concurrent
> removal, but the next driver writer who thinks this is cool is going to
> get it wrong for sure.
>
> Though I still have to figure out what the advantage of invoking a
> function which needs to do a radix tree lookup over a device local
> counter is just to keep track of this.
>
> I'll reply on the TPM part of this as well.
>
> Thanks,
>
>         tglx

I can rework it to use a device local counter.