The cpu-map DT entry in ARM64 can describe the CPU topology in much better way compared to other existing approaches. RISC-V can easily adopt this binding to represent it's own CPU topology. Thus, both cpu-map DT binding and topology parsing code can be moved to a common location so that RISC-V or any other architecture can leverage that. The relevant discussion regarding unifying cpu topology can be found in [1]. arch_topology seems to be a perfect place to move the common code. I have not introduced any functional changes in the moved code. The only downside in this approach is that the capacity code will be executed for RISC-V as well. But, it will exit immediately after not able to find the appropriate DT node. If the overhead is considered too much, we can always compile out capacity related functions under a different config for the architectures that do not support them. The patches have been tested for RISC-V and compile tested for ARM64 & x86. The socket change[2] is also now part of this series. [1] https://lkml.org/lkml/2018/11/6/19 [2] https://lkml.org/lkml/2018/11/7/918 QEMU changes for RISC-V topology are available at https://github.com/atishp04/riscv-qemu/tree/cpu_topo Apologies for the previous patch series with incorrect title and was sent only to kernel mailing list due to a bug in my config. Please ignore that. Atish Patra (3): dt-binding: cpu-topology: Move cpu-map to a common binding. cpu-topology: Move cpu topology code to common code. RISC-V: Parse cpu topology during boot. Sudeep Holla (1): Documentation: DT: arm: add support for sockets defining package boundaries .../{arm/topology.txt => cpu/cpu-topology.txt} | 133 +++++++-- arch/arm64/include/asm/topology.h | 22 -- arch/arm64/kernel/topology.c | 303 +-------------------- arch/riscv/Kconfig | 1 + arch/riscv/kernel/smpboot.c | 3 + drivers/base/arch_topology.c | 294 ++++++++++++++++++++ include/linux/arch_topology.h | 26 ++ include/linux/topology.h | 1 + 8 files changed, 435 insertions(+), 348 deletions(-) rename Documentation/devicetree/bindings/{arm/topology.txt => cpu/cpu-topology.txt} (66%) -- 2.7.4
