[SPARC64]: Make cpu_present_map available earlier.
The change to kernel/sched.c's init code to use for_each_cpu()
requires that the cpu_possible_map be setup much earlier.
Set it up via setup_arch(), constrained to NR_CPUS, and later
constrain it to max_cpus in smp_prepare_cpus().
This fixes SMP booting on sparc64.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/setup.c b/arch/sparc64/kernel/setup.c
index 054461e..158bd31 100644
--- a/arch/sparc64/kernel/setup.c
+++ b/arch/sparc64/kernel/setup.c
@@ -542,6 +542,8 @@
}
#endif
+ smp_setup_cpu_possible_map();
+
paging_init();
}
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 1fb6323..1f7ad8a 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -1079,18 +1079,12 @@
return 0;
}
+/* Constrain the number of cpus to max_cpus. */
void __init smp_prepare_cpus(unsigned int max_cpus)
{
- int instance, mid;
-
- instance = 0;
- while (!cpu_find_by_instance(instance, NULL, &mid)) {
- if (mid < max_cpus)
- cpu_set(mid, phys_cpu_present_map);
- instance++;
- }
-
if (num_possible_cpus() > max_cpus) {
+ int instance, mid;
+
instance = 0;
while (!cpu_find_by_instance(instance, NULL, &mid)) {
if (mid != boot_cpu_id) {
@@ -1105,6 +1099,22 @@
smp_store_cpu_info(boot_cpu_id);
}
+/* Set this up early so that things like the scheduler can init
+ * properly. We use the same cpu mask for both the present and
+ * possible cpu map.
+ */
+void __init smp_setup_cpu_possible_map(void)
+{
+ int instance, mid;
+
+ instance = 0;
+ while (!cpu_find_by_instance(instance, NULL, &mid)) {
+ if (mid < NR_CPUS)
+ cpu_set(mid, phys_cpu_present_map);
+ instance++;
+ }
+}
+
void __devinit smp_prepare_boot_cpu(void)
{
if (hard_smp_processor_id() >= NR_CPUS) {
diff --git a/include/asm-sparc64/smp.h b/include/asm-sparc64/smp.h
index 110a2de..473edb2 100644
--- a/include/asm-sparc64/smp.h
+++ b/include/asm-sparc64/smp.h
@@ -66,8 +66,14 @@
#define raw_smp_processor_id() (current_thread_info()->cpu)
+extern void smp_setup_cpu_possible_map(void);
+
#endif /* !(__ASSEMBLY__) */
+#else
+
+#define smp_setup_cpu_possible_map() do { } while (0)
+
#endif /* !(CONFIG_SMP) */
#define NO_PROC_ID 0xFF
