[PATCH] ppc64: Fix for missing start-cpu rtas token

If the rtas start-cpu token doesnt exist then presume the cpu is already
spinning. If it isnt we will catch it later on when the cpu doesnt
respond.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 11 insertions, 2 deletions

diff --git a/arch/ppc64/kernel/pSeries_smp.c b/arch/ppc64/kernel/pSeries_smp.c
index 79c7f3223665..d2c7e2c4733b 100644
--- a/arch/ppc64/kernel/pSeries_smp.c
+++ b/arch/ppc64/kernel/pSeries_smp.c
@@ -272,6 +272,7 @@ static inline int __devinit smp_startup_cpu(unsigned int lcpu)
         unsigned long start_here = __pa((u32)*((unsigned long *)
                                                pSeries_secondary_smp_init));
         unsigned int pcpu;
+        int start_cpu;
 
         if (cpu_isset(lcpu, of_spin_map))
                 /* Already started by OF and sitting in spin loop */
@@ -282,12 +283,20 @@ static inline int __devinit smp_startup_cpu(unsigned int lcpu)
         /* Fixup atomic count: it exited inside IRQ handler. */
         paca[lcpu].__current->thread_info->preempt_count        = 0;
 
-        status = rtas_call(rtas_token("start-cpu"), 3, 1, NULL,
-                           pcpu, start_here, lcpu);
+        /* 
+         * If the RTAS start-cpu token does not exist then presume the
+         * cpu is already spinning.
+         */
+        start_cpu = rtas_token("start-cpu");
+        if (start_cpu == RTAS_UNKNOWN_SERVICE)
+                return 1;
+
+        status = rtas_call(start_cpu, 3, 1, NULL, pcpu, start_here, lcpu);
         if (status != 0) {
                 printk(KERN_ERR "start-cpu failed: %i\n", status);
                 return 0;
         }
+
         return 1;
 }