Rename irqsave() and irqrestore() to up_irq_save() and up_irq_restore()

arch/sim/include/irq.h

@@ -91,12 +91,22 @@ struct xcptcontext
  ****************************************************************************/
 
 #ifndef __ASSEMBLY__
-static inline irqstate_t irqsave(void)
+
+/* Name: up_irq_save, up_irq_restore, and friends.
+ *
+ * NOTE: This function should never be called from application code and,
+ * as a general rule unless you really know what you are doing, this
+ * function should not be called directly from operation system code either:
+ * Typically, the wrapper functions, enter_critical_section() and
+ * leave_critical section(), are probably what you really want.
+ */
+
+static inline irqstate_t up_irq_save(void)
 {
   return 0;
 }
 
-static inline void irqrestore(irqstate_t flags)
+static inline void up_irq_restore(irqstate_t flags)
 {
 }
 #endif

arch/sim/include/types.h

@@ -90,7 +90,7 @@ typedef unsigned int       _uintptr_t;
 #endif
 
 /* This is the size of the interrupt state save returned by
- * irqsave()
+ * up_irq_save()
  */
 
 typedef unsigned int       irqstate_t;