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

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

commit 77c0a700c1
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>
This commit is contained in:
Kumar Gala 2009-09-08 17:38:52 +00:00 committed by Benjamin Herrenschmidt
parent 8708d002c4
commit 757cbd46d1
2 changed files with 7 additions and 13 deletions
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10
arch/powerpc/kernel/smp.c
View File

@ -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);

10
arch/powerpc/platforms/85xx/smp.c
View File

@ -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))