On Tue, 2017-05-16 at 08:49:43 UTC, "Gautham R. Shenoy" wrote: > From: "Gautham R. Shenoy" <e...@linux.vnet.ibm.com> > > 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 <e...@linux.vnet.ibm.com>
Series applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/5f221c3ca13dceaea8eefe21dbd85d cheers
