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authorYicong Yang <yangyicong@hisilicon.com>2022-09-05 15:26:15 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-09-07 18:57:31 +0300
commit5ac251c8a05ce074e5efac779debf82a15d870a3 (patch)
tree26a26b0996cbdb1670753815ac2863833714d200 /drivers/base
parentc2e406596571659451f4b95e37ddfd5a8ef1d0dc (diff)
downloadlinux-5ac251c8a05ce074e5efac779debf82a15d870a3.tar.xz
arch_topology: Make cluster topology span at least SMT CPUs
Currently cpu_clustergroup_mask() will return CPU mask if cluster span more or the same CPUs as cpu_coregroup_mask(). This will result topology borken on non-Cluster SMT machines when building with CONFIG_SCHED_CLUSTER=y. Test with: qemu-system-aarch64 -enable-kvm -machine virt \ -net none \ -cpu host \ -bios ./QEMU_EFI.fd \ -m 2G \ -smp 48,sockets=2,cores=12,threads=2 \ -kernel $Image \ -initrd $Rootfs \ -nographic -append "rdinit=init console=ttyAMA0 sched_verbose loglevel=8" We'll get below error: [ 3.084568] BUG: arch topology borken [ 3.084570] the SMT domain not a subset of the CLS domain Since cluster is a level higher than SMT, fix this by making cluster spans at least SMT CPUs. Fixes: bfcc4397435d ("arch_topology: Limit span of cpu_clustergroup_mask()") Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Cc: Ionela Voinescu <ionela.voinescu@arm.com> Cc: Greg KH <gregkh@linuxfoundation.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Link: https://lore.kernel.org/r/20220905122615.12946-1-yangyicong@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/arch_topology.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index eaa1b8d2d39d..46cbe4471e78 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -724,7 +724,7 @@ const struct cpumask *cpu_clustergroup_mask(int cpu)
*/
if (cpumask_subset(cpu_coregroup_mask(cpu),
&cpu_topology[cpu].cluster_sibling))
- return get_cpu_mask(cpu);
+ return topology_sibling_cpumask(cpu);
return &cpu_topology[cpu].cluster_sibling;
}