• Heiko Carstens's avatar
    [S390] smp: fix prefix handling of offlined cpus · 4f8048ee
    Heiko Carstens authored
    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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>