[SPARC]: Add topology_init()

Fix a crash in SMP mode by adding the missing topology_init.
Also makes /proc/cpuinfo backwards compatible with 2.4.

Signed-off-by: Bob Breuer <breuerr@mc.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 31 insertions, 1 deletions

diff --git a/arch/sparc/kernel/setup.c b/arch/sparc/kernel/setup.c
index 3509e4305532..8531a8e15832 100644
--- a/arch/sparc/kernel/setup.c
+++ b/arch/sparc/kernel/setup.c
@@ -31,6 +31,7 @@
 #include <linux/console.h>
 #include <linux/spinlock.h>
 #include <linux/root_dev.h>
+#include <linux/cpu.h>
 
 #include <asm/system.h>
 #include <asm/io.h>
@@ -389,6 +390,8 @@ console_initcall(set_preferred_console);
 extern char *sparc_cpu_type;
 extern char *sparc_fpu_type;
 
+static int ncpus_probed;
+
 static int show_cpuinfo(struct seq_file *m, void *__unused)
 {
         seq_printf(m,
@@ -411,7 +414,7 @@ static int show_cpuinfo(struct seq_file *m, void *__unused)
                    romvec->pv_printrev >> 16,
                    romvec->pv_printrev & 0xffff,
                    &cputypval,
-                   num_possible_cpus(),
+                   ncpus_probed,
                    num_online_cpus()
 #ifndef CONFIG_SMP
                    , cpu_data(0).udelay_val/(500000/HZ),
@@ -471,3 +474,30 @@ void sun_do_break(void)
 
 int serial_console = -1;
 int stop_a_enabled = 1;
+
+static int __init topology_init(void)
+{
+        int i, ncpus, err;
+
+        /* Count the number of physically present processors in
+         * the machine, even on uniprocessor, so that /proc/cpuinfo
+         * output is consistent with 2.4.x
+         */
+        ncpus = 0;
+        while (!cpu_find_by_instance(ncpus, NULL, NULL))
+                ncpus++;
+        ncpus_probed = ncpus;
+
+        err = 0;
+        for_each_online_cpu(i) {
+                struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
+                if (!p)
+                        err = -ENOMEM;
+                else
+                        register_cpu(p, i, NULL);
+        }
+
+        return err;
+}
+
+subsys_initcall(topology_init);