diff --git a/include/linux/oprofile.h b/include/linux/oprofile.h
index 559c4c3..b5b3197 100644
--- a/include/linux/oprofile.h
+++ b/include/linux/oprofile.h
@@ -61,6 +61,16 @@
  */
 void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);
 
+/**
+ * Add an extended sample.  Use this when the PC is not from the regs, and
+ * we cannot determine if we're in kernel mode from the regs.
+ *
+ * This function does perform a backtrace.
+ *
+ */
+void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
+				unsigned long event, int is_kernel);
+
 /* Use this instead when the PC value is not from the regs. Doesn't
  * backtrace. */
 void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event);