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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2006-07-04 14:09:36 +1000
committerPaul Mackerras <paulus@samba.org>2006-07-26 01:27:04 +1000
commit8cffc6ac66a2b251df2490702923611aa4ac1fc5 (patch)
tree7ae7509d009739702cab10441a61c4c36c5913a8 /arch/powerpc/kernel/smp.c
parent21bd2e6696bb5c8b32b00a0ea597f49bfda0ddc6 (diff)
[POWERPC] Fix non-MPIC CHRPs with CONFIG_SMP set
Pseudo-CHRP machines like Pegasos without an MPIC would crash at boot if CONFIG_SMP was set because the "smp_ops" pointer was set to MPIC related ops unconditionally. This patch makes it NULL on machines that don't support SMP and provides proper default behaviour in the callers when smp_ops is NULL. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/smp.c')
-rw-r--r--arch/powerpc/kernel/smp.c24
1 files changed, 17 insertions, 7 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 46c56cfd1b2f..6a9bc9ce54e0 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -144,13 +144,15 @@ void smp_message_recv(int msg, struct pt_regs *regs)
void smp_send_reschedule(int cpu)
{
- smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE);
+ if (likely(smp_ops))
+ smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE);
}
#ifdef CONFIG_DEBUGGER
void smp_send_debugger_break(int cpu)
{
- smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK);
+ if (likely(smp_ops))
+ smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK);
}
#endif
@@ -158,7 +160,7 @@ void smp_send_debugger_break(int cpu)
void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
{
crash_ipi_function_ptr = crash_ipi_callback;
- if (crash_ipi_callback) {
+ if (crash_ipi_callback && smp_ops) {
mb();
smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_DEBUGGER_BREAK);
}
@@ -220,6 +222,9 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
+ if (unlikely(smp_ops == NULL))
+ return -1;
+
data.func = func;
data.info = info;
atomic_set(&data.started, 0);
@@ -357,7 +362,10 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
smp_store_cpu_info(boot_cpuid);
cpu_callin_map[boot_cpuid] = 1;
- max_cpus = smp_ops->probe();
+ if (smp_ops)
+ max_cpus = smp_ops->probe();
+ else
+ max_cpus = 1;
smp_space_timers(max_cpus);
@@ -453,7 +461,7 @@ void generic_mach_cpu_die(void)
static int __devinit cpu_enable(unsigned int cpu)
{
- if (smp_ops->cpu_enable)
+ if (smp_ops && smp_ops->cpu_enable)
return smp_ops->cpu_enable(cpu);
return -ENOSYS;
@@ -467,7 +475,8 @@ int __devinit __cpu_up(unsigned int cpu)
if (!cpu_enable(cpu))
return 0;
- if (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))
+ if (smp_ops == NULL ||
+ (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu)))
return -EINVAL;
/* Make sure callin-map entry is 0 (can be leftover a CPU
@@ -568,7 +577,8 @@ void __init smp_cpus_done(unsigned int max_cpus)
old_mask = current->cpus_allowed;
set_cpus_allowed(current, cpumask_of_cpu(boot_cpuid));
- smp_ops->setup_cpu(boot_cpuid);
+ if (smp_ops)
+ smp_ops->setup_cpu(boot_cpuid);
set_cpus_allowed(current, old_mask);