/**
* set_mtrr_state - Set the MTRR state for this CPU.
*
- * NOTE: The CPU must already be in a safe state for MTRR changes.
+ * NOTE: The CPU must already be in a safe state for MTRR changes, including
+ * measures that only a single CPU can be active in set_mtrr_state() in
+ * order to not be subject to races for usage of deftype_lo. This is
+ * accomplished by taking set_atomicity_lock.
* RETURNS: 0 if no changes made, else a mask indicating what was changed.
*/
static unsigned long set_mtrr_state(void)