asmlinkage: Mark rwsem functions that can be called from assembler asmlinkage

Mark the rwsem functions that can be called from assembler asmlinkage.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391845930-28580-9-git-send-email-ak@linux.intel.com


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