asmlinkage, mutex: Mark __visible

Various kernel/mutex.c functions can be called from
inline assembler, so they should be all global and
__visible.

Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391845930-28580-7-git-send-email-ak@linux.intel.com


Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>