powerpc: Don't setup CPUs with bad status

commit 59a53afe70fd530040bdc69581f03d880157f15a upstream.

OPAL will mark a CPU that is guarded as "bad" in the status property of the CPU
node.

Unfortunatley Linux doesn't check this property and will put the bad CPU in the
present map.  This has caused hangs on booting when we try to unsplit the core.

This patch checks the CPU is avaliable via this status property before putting
it in the present map.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Tested-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index bc76cc6b419c2a8d0b5491637afadfe046278142..486cc04d5a09b0555fce32548df88ea81b6d2adc 100644 (file)
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -458,7 +458,7 @@ void __init smp_setup_cpu_maps(void)
                for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
                        DBG("    thread %d -> cpu %d (hard id %d)\n",
                            j, cpu, be32_to_cpu(intserv[j]));
-                       set_cpu_present(cpu, true);
+                       set_cpu_present(cpu, of_device_is_available(dn));
                        set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
                        set_cpu_possible(cpu, true);
                        cpu++;