update some comments

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4126 42af7a65-404d-4744-a932-0658087f49c3

arch/mips/src/pic32mx/pic32mx-decodeirq.c

@@ -152,6 +152,12 @@ uint32_t *pic32mx_decodeirq(uint32_t *regs)
    */
 
 #ifdef CONFIG_PIC32MX_NESTED_INTERRUPTS
+  /* I think there are some task switching issues here.  You should not
+   * enable nested interrupts unless you are ready to deal with the 
+   * complexities of nested context switching.  The logic here is probably
+   * insufficient.
+   */
+
   current_regs = savestate;
   if (current_regs == NULL)
     {