tree d1fbc2a6a8e86af9308ce8713e842e6717471c8e
parent 267239cc10f18251892a0783104df3dc22b620d5
author Heiko Carstens <heiko.carstens@de.ibm.com> 1502111775 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1502284175 -0400

s390/cpcmd,vmcp: avoid GFP_DMA allocations

According to the CP Programming Services manual Diagnose Code 8
"Virtual Console Function" can be used in all addressing modes. Also
the input and output buffers do not have a limitation which specifies
they need to be below the 2GB line.

This is true at least since z/VM 5.4.

Therefore remove the sam31/64 instructions and allow for simple
GFP_KERNEL allocations. This makes it easier to allocate a 1MB page
if the user requested such a large return buffer.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>