Build problems in stable queue

Couple of powerpc problems.

4.14, 4.16:

drivers/net/ethernet/ibm/ibmvnic.c:1460:10: error: 'struct ibmvnic_tx_buff' has no member named 'num_entries'

3.18, 4.4:

arch/powerpc/xmon/xmon.c:1180:7: error: 'xmon_on' undeclared

Also, {i386,x86_64}:allnoconfig in 3.18:

arch/x86/mm/pageattr.c:281:6: error: ‘kernel_set_to_readonly’ undeclared

Most boot tests pass, except for a couple of powerpc tests where the image fails to build.

Guenter