Re: [patch V2 07/15] powerpc/ps3: Convert half completion to rcuwait

Thomas Gleixner
2020-03-21T10:42:17Z

Christoph Hellwig <hch@infradead.org> writes:

> On Wed, Mar 18, 2020 at 09:43:09PM +0100, Thomas Gleixner wrote:
>> The PS3 notification interrupt and kthread use a hacked up completion to
>> communicate. Since we're wanting to change the completion implementation and
>> this is abuse anyway, replace it with a simple rcuwait since there is only ever
>> the one waiter.
>>
>> AFAICT the kthread uses TASK_INTERRUPTIBLE to not increase loadavg, kthreads
>> cannot receive signals by default and this one doesn't look different. Use
>> TASK_IDLE instead.
>
> I think the right fix here is to jut convert the thing to a threaded
> interrupt handler and kill off the stupid kthread.

That'd be a major surgery.

> But I wonder how alive the whole PS3 support is to start with..

There seem to be a few enthusiast left which have a Other-OS capable PS3

Thanks,

tglx