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[S390] topology: fix cpu masks for topology=off case

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Fix cpu masks for 'topology=off' case. Folding of the scheduling domains
happen in such a way that everything belongs to the MC domain instead
of the CPU doimain.
This should fix a performance regression introduced with
eafd2b6d "[S390] topology: use default MC domain initializer" and also
makes sure we have the same behavious as if CONFIG_SCHED_MC was not
selected at all.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2010-10-29 16:50:38 +02:00 committed by Martin Schwidefsky
parent 8d11e02183
commit 0b52783d4f
1 changed files with 4 additions and 2 deletions
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6
arch/s390/kernel/topology.c
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@ -53,8 +53,10 @@ static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
cpumask_t mask;
cpus_clear(mask);
if (!topology_enabled || !MACHINE_HAS_TOPOLOGY)
return cpu_possible_map;
if (!topology_enabled || !MACHINE_HAS_TOPOLOGY) {
cpumask_copy(&mask, cpumask_of(cpu));
return mask;
}
while (info) {
if (cpu_isset(cpu, info->mask)) {
mask = info->mask;