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authorHeiko Carstens <heiko.carstens@de.ibm.com>2010-10-29 16:50:38 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-10-29 16:50:50 +0200
commit0b52783d4feb14d6ff990a63512a66d6131d41f9 (patch)
tree5b10a1f7d105299b49612f0c5076bda3640611b8 /arch/s390
parent8d11e0218321fccc6912c4dcfbaf2095bad5d33a (diff)
downloadop-kernel-dev-0b52783d4feb14d6ff990a63512a66d6131d41f9.zip
op-kernel-dev-0b52783d4feb14d6ff990a63512a66d6131d41f9.tar.gz
[S390] topology: fix cpu masks for topology=off case
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>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kernel/topology.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index a9dee90..94b06c3 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -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;
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