Merge branch 'arm-aesbs' of git://git.linaro.org/people/ardbiesheuvel/linux-arm into devel-stable

1 files changed, 16 insertions, 10 deletions

diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c
index 1c1771a40250..24f58cb0a543 100644
--- a/arch/powerpc/platforms/pseries/smp.c
+++ b/arch/powerpc/platforms/pseries/smp.c
@@ -233,18 +233,24 @@ static void __init smp_init_pseries(void)
 
         alloc_bootmem_cpumask_var(&of_spin_mask);
 
-        /* Mark threads which are still spinning in hold loops. */
-        if (cpu_has_feature(CPU_FTR_SMT)) {
-                for_each_present_cpu(i) { 
-                        if (cpu_thread_in_core(i) == 0)
-                                cpumask_set_cpu(i, of_spin_mask);
-                }
-        } else {
-                cpumask_copy(of_spin_mask, cpu_present_mask);
+        /*
+         * Mark threads which are still spinning in hold loops
+         *
+         * We know prom_init will not have started them if RTAS supports
+         * query-cpu-stopped-state.
+         */
+        if (rtas_token("query-cpu-stopped-state") == RTAS_UNKNOWN_SERVICE) {
+                if (cpu_has_feature(CPU_FTR_SMT)) {
+                        for_each_present_cpu(i) {
+                                if (cpu_thread_in_core(i) == 0)
+                                        cpumask_set_cpu(i, of_spin_mask);
+                        }
+                } else
+                        cpumask_copy(of_spin_mask, cpu_present_mask);
+
+                cpumask_clear_cpu(boot_cpuid, of_spin_mask);
         }
 
-        cpumask_clear_cpu(boot_cpuid, of_spin_mask);
-
         /* Non-lpar has additional take/give timebase */
         if (rtas_token("freeze-time-base") != RTAS_UNKNOWN_SERVICE) {
                 smp_ops->give_timebase = rtas_give_timebase;