Re: [PATCH 1/3] powernv:idle: Use correct IDLE_THREAD_BITS in POWER8/9

[Michael Ellerman]

Michael Neuling <mikey@xxxxxxxxxxx> writes:

> On Wed, 2017-04-12 at 17:16 +0530, Gautham R. Shenoy wrote:
>> From: "Gautham R. Shenoy" <ego@xxxxxxxxxxxxxxxxxx>
>> 
>> This patch ensures that POWER8 and POWER9 processors use the correct
>> value of IDLE_THREAD_BITS as POWER8 has 8 threads per core and hence
>> the IDLE_THREAD_BITS should be 0xFF while POWER9 has only 4 threads
>> per core and hence the IDLE_THREAD_BITS should be 0xF.
>
> Why don't we derive this from the device tree rather than hard wiring it per cpu
> type?

Right.

In fact we already have threads_per_core which is exactly that.

cheers