[PATCH] x86_64: Initialize powernow_data[] for all siblings

I got an oops on a dual core system because the lost tick handler
called cpufreq_get() on core 1 and powernow tried to follow
a NULL powernow_data[] pointer there.

Initialize powernow_data for all cores of a CPU.

Cc: Jacob Shin <jacob.shin@amd.com>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
index d09bec7..e5bc064 100644 (file)
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
@@ -54,7 +54,7 @@ static DECLARE_MUTEX(fidvid_sem);
 static struct powernow_k8_data *powernow_data[NR_CPUS];
 
 #ifndef CONFIG_SMP
-static cpumask_t cpu_core_map[1];
+static cpumask_t cpu_core_map[1] = { CPU_MASK_ALL };
 #endif
 
 /* Return a frequency in MHz, given an input fid */
@@ -976,7 +976,7 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
 {
        struct powernow_k8_data *data;
        cpumask_t oldmask = CPU_MASK_ALL;
-       int rc;
+       int rc, i;
 
        if (!cpu_online(pol->cpu))
                return -ENODEV;
@@ -1062,7 +1062,8 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
        printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
               data->currfid, data->currvid);
 
-       powernow_data[pol->cpu] = data;
+       for_each_cpu_mask(i, cpu_core_map[pol->cpu])
+               powernow_data[i] = data;
 
        return 0;