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| author | Yicong Yang <yangyicong@hisilicon.com> | 2022-09-05 15:26:15 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-09-07 18:57:31 +0300 |
| commit | 5ac251c8a05ce074e5efac779debf82a15d870a3 (patch) | |
| tree | 26a26b0996cbdb1670753815ac2863833714d200 /drivers/base | |
| parent | c2e406596571659451f4b95e37ddfd5a8ef1d0dc (diff) | |
| download | linux-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.c | 2 |
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; } |