We need to set the thread priority to medium when entering all exceptions. 
We may have been executing in low priority (eg the idle loop), but
definitely do not want to remain in that priority for the duration of the
exception (eg a device interrupt).
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>