1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c
index f9bda64fcd1b..43b01daa91e1 100644
--- a/drivers/oprofile/oprof.c
+++ b/drivers/oprofile/oprof.c
@@ -239,6 +239,38 @@ int oprofile_set_ulong(unsigned long *addr, unsigned long val)
         return err;
 }
 
+#ifdef CONFIG_HAVE_HWSAMPLER
+int oprofile_set_hwsampler(unsigned long val)
+{
+        int err = 0;
+
+        mutex_lock(&start_mutex);
+
+        if (oprofile_started) {
+                err = -EBUSY;
+                goto out;
+        }
+
+        switch (val) {
+        case 1:
+                /* Switch to hardware sampling. */
+                __oprofile_timer_exit();
+                err = oprofile_arch_set_hwsampler(&oprofile_ops);
+                break;
+        case 0:
+                printk(KERN_INFO "oprofile: using timer interrupt.\n");
+                err = __oprofile_timer_init(&oprofile_ops);
+                break;
+        default:
+                err = -EINVAL;
+        }
+
+out:
+        mutex_unlock(&start_mutex);
+        return err;
+}
+#endif /* CONFIG_HAVE_HWSAMPLER */
+
 static int __init oprofile_init(void)
 {
         int err;