tree 650554ccd94393eda80969c42dd52c3ef13aa2db
parent 8ca45667f966968132c772ddbb6468b41a817c19
author Heiko Carstens <heiko.carstens@de.ibm.com> 1256825049 +0100
committer Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> 1256825112 +0100

[S390] smp: fix prefix handling of offlined cpus

Offlined cpus still have valid prefix register contents. Dumpers
will store the register contents of a cpu to the location where its
prefix register points to.
For offlined cpus the area (lowcore) has been freed and the dumper
would write the uninteresting contents of the offline cpu to a memory
location which might be in use by some other component and destroy
valueable information.
To fix this set the prefix register of offline cpus to absolute
address zero again. This prevents the current dumpers to write to
random memory locations.

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