tree 6c5fba8420defba05733d1fdd12f717bcfa042b3
parent a7e137eb94b6abd180050cf0b42e8b3db7efbf5f
author Heiko Carstens <heiko.carstens@de.ibm.com> 1446728612 +0100
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1450447166 +0100

s390: compile head.S always with -march=z900

head.S on s390 contains some sanity checks if the kernel will run on a
machine or if the machine is too old, e.g. if the kernel contains
instructions not available on the machine. If so, it will emit an error
message to the console before it stops execution.

Therefore head.S contains only instructions which are availanble with the
earliest machine generation (z900).  In order to make sure we don't
accidently add instructions which are not available on z900, always compile
with -march=z900. This makes sure compilation will fail if wrong
instructions are used.

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