title: ARM THUMB mode issue on Cortex A15
body: <p>we are using cortex A15, and kernel 3.8.
  If I compile 
  arm-gcc-4.7.3 test.c -o test_thumb -mthumb</p>
  
  <p>In Kernel if I set CONFIG_ARM_THUMB or unset. my THUMB(user space) always run, </p>
  
  <p>So i could not understand the behavior. </p>