tree 075b6001e1842c435fc30e2c3ca2bad708ba3ca5
parent 7eb792bf7c253cb63202aae72885f5f7abdd8668
author Heiko Carstens <heiko.carstens@de.ibm.com> 1457602341 +0100
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1457616935 +0100

s390/cpumf: add missing lpp magic initialization

Add the missing lpp magic initialization for cpu 0. Without this all
samples on cpu 0 do not have the most significant bit set in the
program parameter field, which we use to distinguish between guest and
host samples if the pid is also 0.

We did initialize the lpp magic in the absolute zero lowcore but
forgot that when switching to the allocated lowcore on cpu 0 only.

Reported-by: Shu Juan Zhang <zhshuj@cn.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: stable@vger.kernel.org # v4.4+
Fixes: e22cf8ca6f75 ("s390/cpumf: rework program parameter setting to detect guest samples")
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>