From: Martin Schwidefsky <schwidefsky@de.ibm.com>

s390 core changes:
 - Merge 31 and 64 bit NR_CPUS config option. Default to 32 cpus.
 - Remove unused system calls from compat_linux.c.
 - Add statfs64 and fstatfs64. Reserve system call number for
   remap_file_pages.
 - Merge do_signal32 into do_signal.
 - Don't remove the per bit and the program mask from the user psw
   due to a signal.
 - Fix a problem with gdb and interrupted system calls.
 - Fix single stepping of interrupted system calls.
 - Fix compiler warnings in bitops.h.