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authorHeiko Carstens <heiko.carstens@de.ibm.com>2012-08-30 14:24:42 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-09-26 15:45:04 +0200
commitc5e3acd666543544d402c83d24d44e487fb51f11 (patch)
treea73b7dea31241de6e379660bcd6fca6a39b9482b /block
parentfbf3c54239f77a82218002e0c511819e274e7cd4 (diff)
s390/smp: avoid concurrent write to sigp status field
When a sigp instruction is issued it may store a status. This status is currently stored in a per cpu field of the target cpu. If multiple cpus issue a sigp instruction with the same target cpu and a status is stored the result is not necessarily as expected. Currently this is not an issue: - on cpu hotplug no sigps, except "restart" and "sense" are sent to the target cpu. - on external call we don't look at the status if it is stored - on sense running the condition code "status stored" is sufficient to tell if a cpu is running or not Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions

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