Re: [1/6] powernv:idle: Correctly initialize core_idle_state_ptr

[Michael Ellerman]

On Tue, 2017-05-16 at 08:49:43 UTC, "Gautham R. Shenoy" wrote:
> From: "Gautham R. Shenoy" <ego@xxxxxxxxxxxxxxxxxx>
> 
> The lower 8 bits of core_idle_state_ptr tracks the number of non-idle
> threads in the core. This is supposed to be initialized to bit-map
> corresponding to the threads_per_core. However, currently it is
> initialized to PNV_CORE_IDLE_THREAD_BITS (0xFF). This is correct for
> POWER8 which has 8 threads per core, but not for POWER9 which has 4
> threads per core.
> 
> As a result, on POWER9, core_idle_state_ptr gets initialized to
> 0xFF. In case when all the threads of the core are idle, the bits
> corresponding tracking the idle-threads are non-zero. As a result, the
> idle entry/exit code fails to save/restore per-core hypervisor state
> since it assumes that there are threads in the cores which are still
> active.
> 
> Fix this by correctly initializing the lower bits of the
> core_idle_state_ptr on the basis of threads_per_core.
> 
> Signed-off-by: Gautham R. Shenoy <ego@xxxxxxxxxxxxxxxxxx>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/5f221c3ca13dceaea8eefe21dbd85d

cheers