From: Bodo Stroesser <bstroesser@fujitsu-siemens.com>

This makes the UML signal frame construction interface somewhat more similar
to x86 than before.  Also, some small code cleanup, and checking for errors
before changing the signal mask in the SA_NODEFER case.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>