Merge commit 'v2.6.37' into perf/core
[linux-2.6.git] / arch / x86 / oprofile / op_model_amd.c
index f2984d4..51104b3 100644 (file)
@@ -637,21 +637,29 @@ static int __init_ibs_nmi(void)
        return 0;
 }
 
-/* initialize the APIC for the IBS interrupts if available */
+/*
+ * check and reserve APIC extended interrupt LVT offset for IBS if
+ * available
+ *
+ * init_ibs() preforms implicitly cpu-local operations, so pin this
+ * thread to its current CPU
+ */
+
 static void init_ibs(void)
 {
-       ibs_caps = get_ibs_caps();
+       preempt_disable();
 
+       ibs_caps = get_ibs_caps();
        if (!ibs_caps)
-               return;
+               goto out;
 
-       if (__init_ibs_nmi()) {
+       if (__init_ibs_nmi() < 0)
                ibs_caps = 0;
-               return;
-       }
+       else
+               printk(KERN_INFO "oprofile: AMD IBS detected (0x%08x)\n", ibs_caps);
 
-       printk(KERN_INFO "oprofile: AMD IBS detected (0x%08x)\n",
-              (unsigned)ibs_caps);
+out:
+       preempt_enable();
 }
 
 static int (*create_arch_files)(struct super_block *sb, struct dentry *root);