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Subject[PATCH 3/4] arch/arm64: Rebuild sched_domain hierarchy when cpu capacity changes
Asymmetric cpu capacity can not necessarily be determined accurately at
the time the initial sched_domain hierarchy is built during boot. It is
therefore necessary to be able to force a full rebuild of the hierarchy
later triggered by the arch_topology driver. A full rebuild requires the
arch-code to implement arch_update_cpu_topology() which isn't yet
implemented for arm64. This patch points the arm64 implementation to
arch_topology driver to ensure that full hierarchy rebuild happens when

cc: Catalin Marinas <>
cc: Will Deacon <>

Signed-off-by: Morten Rasmussen <>
arch/arm64/include/asm/topology.h | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/topology.h
index df48212f767b..61ba09d48237 100644
--- a/arch/arm64/include/asm/topology.h
+++ b/arch/arm64/include/asm/topology.h
@@ -43,6 +43,9 @@ int pcibus_to_node(struct pci_bus *bus);
/* Replace task scheduler's default cpu-invariant accounting */
#define arch_scale_cpu_capacity topology_get_cpu_scale

+/* Enable topology flag updates */
+#define arch_update_cpu_topology topology_update_cpu_topology
#include <asm-generic/topology.h>

#endif /* _ASM_ARM_TOPOLOGY_H */
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