powerpc/85xx: Fix SMP compile error and allow NULL for smp_ops

The following commit introduced a compile error since it removed
the implementation of smp_85xx_basic_setup:

commit 77c0a700c1c292edafa11c1e52821ce4636f81b0
Author: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date:   Fri Aug 28 14:25:04 2009 +1000

    powerpc: Properly start decrementer on BookE secondary CPUs

Make it so that smp_ops probe() and setup_cpu() can be set to NULL.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 96f107c..d387b39 100644 (file)
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -269,7 +269,10 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
        cpu_callin_map[boot_cpuid] = 1;
 
        if (smp_ops)
-               max_cpus = smp_ops->probe();
+               if (smp_ops->probe)
+                       max_cpus = smp_ops->probe();
+               else
+                       max_cpus = NR_CPUS;
        else
                max_cpus = 1;
  
@@ -493,7 +496,8 @@ int __devinit start_secondary(void *unused)
        preempt_disable();
        cpu_callin_map[cpu] = 1;
 
-       smp_ops->setup_cpu(cpu);
+       if (smp_ops->setup_cpu)
+               smp_ops->setup_cpu(cpu);
        if (smp_ops->take_timebase)
                smp_ops->take_timebase();
 
@@ -556,7 +560,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
        old_mask = current->cpus_allowed;
        set_cpus_allowed(current, cpumask_of_cpu(boot_cpuid));
        
-       if (smp_ops)
+       if (smp_ops && smp_ops->setup_cpu)
                smp_ops->setup_cpu(boot_cpuid);
 
        set_cpus_allowed(current, old_mask);

diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c
index 94f901d..04160a4 100644 (file)
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -88,25 +88,15 @@ struct smp_ops_t smp_85xx_ops = {
        .kick_cpu = smp_85xx_kick_cpu,
 };
 
-static int __init smp_dummy_probe(void)
-{
-       return NR_CPUS;
-}
-
 void __init mpc85xx_smp_init(void)
 {
        struct device_node *np;
 
-       smp_85xx_ops.message_pass = NULL;
-
        np = of_find_node_by_type(NULL, "open-pic");
        if (np) {
                smp_85xx_ops.probe = smp_mpic_probe;
                smp_85xx_ops.setup_cpu = smp_85xx_setup_cpu;
                smp_85xx_ops.message_pass = smp_mpic_message_pass;
-       } else {
-               smp_85xx_ops.probe = smp_dummy_probe;
-               smp_85xx_ops.setup_cpu = smp_85xx_basic_setup;
        }
 
        if (cpu_has_feature(CPU_FTR_DBELL))