tree ae063160976a1124abfa46550c13347aecd1a37d
parent cabc4abe8e368d754805691b146f31f574533cfa
author Martin Schwidefsky <schwidefsky@de.ibm.com> 1439551228 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1439973604 +0200

s390/setup: fix novx parameter

The novx parameter disables the vector facility but the HWCAP_S390_VXRS
bit in the ELf hardware capabilies is always set if the machine has
the vector facility. If the user space program uses the "vx" string
in the features field of /proc/cpuinfo to utilize vector instruction
it will crash if the novx kernel paramter is set.

Convert setup_hwcaps to an arch_initcall and use MACHINE_HAS_VX to
decide if the HWCAPS_S390_VXRS bit needs to be set.

Cc: stable@vger.kernel.org # 3.18+
Reported-by: Ulrich Weigand <uweigand@de.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>