On Thu, 2019-08-08 at 12:48:26 UTC, Christophe Leroy wrote:
> Santa commit ebb9d30a6a74 ("powerpc/mm: any thread in one core can be
> the first to setup TLB1") removed the need to know the cpu_id in
> early_init_this_mmu(), but the call to smp_processor_id() which was
> marked __maybe_used remained.
>
> Since commit ed1cd6deb013 ("powerpc: Activate
> CONFIG_THREAD_INFO_IN_TASK") thread_info cannot be reached before mmu
> is properly set up.
>
> Drop this stale call to smp_processor_id() which make SMP hang
> when CONFIG_PREEMPT is set.
>
> Reported-by: Chris Packham <chris.pack...@alliedtelesis.co.nz>
> Fixes: ebb9d30a6a74 ("powerpc/mm: any thread in one core can be the first to
> setup TLB1")
> Link: https://github.com/linuxppc/issues/issues/264
> Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
> Cc: sta...@vger.kernel.org
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/b9ee5e04fd77898208c51b1395fa0b5e8536f9b6
cheers
