Fix sys_sigreturn and sys_rt_sigreturn to avoid calling copy_from_user inside
a spinlock.  We copy the blocked signal mask into a local sigset_t before the
spinlock and then just assign from it inside the lock.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>