[PATCH] add smp_setup_processor_id()

Presently, smp_processor_id() isn't necessarily set up until setup_arch().
But it's used in boot_cpu_init() and printk() and perhaps in other places,
prior to setup_arch() being called.

So provide a new smp_setup_processor_id() which is called before anything
else, wire it up for Voyager (which boots on a CPU other than #0, and broke).

Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 15 insertions, 0 deletions

diff --git a/arch/i386/mach-voyager/voyager_smp.c b/arch/i386/mach-voyager/voyager_smp.c
index 5b8b579a079f..6e9e494c6c3d 100644
--- a/arch/i386/mach-voyager/voyager_smp.c
+++ b/arch/i386/mach-voyager/voyager_smp.c
@@ -1938,3 +1938,9 @@ smp_cpus_done(unsigned int max_cpus)
 {
         zap_low_mappings();
 }
+
+void __init
+smp_setup_processor_id(void)
+{
+        current_thread_info()->cpu = hard_smp_processor_id();
+}
diff --git a/include/linux/smp.h b/include/linux/smp.h
index c93c3fe4308c..837e8bce1349 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -125,4 +125,6 @@ static inline void smp_send_reschedule(int cpu) { }
 #define put_cpu()               preempt_enable()
 #define put_cpu_no_resched()    preempt_enable_no_resched()
 
+void smp_setup_processor_id(void);
+
 #endif /* __LINUX_SMP_H */
diff --git a/init/main.c b/init/main.c
index bce0eb7f4f8f..ae04eb78a93a 100644
--- a/init/main.c
+++ b/init/main.c
@@ -446,10 +446,17 @@ static void __init boot_cpu_init(void)
         cpu_set(cpu, cpu_possible_map);
 }
 
+void __init __attribute__((weak)) smp_setup_processor_id(void)
+{
+}
+
 asmlinkage void __init start_kernel(void)
 {
         char * command_line;
         extern struct kernel_param __start___param[], __stop___param[];
+
+        smp_setup_processor_id();
+
 /*
  * Interrupts are still disabled. Do necessary setups, then
  * enable them