[PATCH v1 0/6] RISC-V: hwprobe: Introduce which-cpus

Andrew Jones
2023-10-11T13:56:29Z

This series introduces a flag for the hwprobe syscall which
effectively reverses its behavior from getting the values of
keys for a set of cpus to getting the cpus for a set of key-value
pairs. The series was originally posted as an RFC[1] and based on
another series. v1 is now only based on a single patch pointed out
with the tag below.

Based-on: https://lore.kernel.org/all/20231010165101.14942-2-ajones@ventanamicro.com/

[1] https://lore.kernel.org/all/20230921125518.175428-7-ajones@ventanamicro.com/

Changes since the RFC:
- Split hwprobe out of sys_riscv.c into its own file [Palmer]
- Split the which-cpus functionality out of do_riscv_hwprobe() [Palmer]
- Rename hwprobe_key_is_map to hwprobe_key_is_bitmask [Evan]
- Move the homogeneous_cpus logic into the vDSO function [Evan]
- Rework logic to not need to allocate any memory
- Honor cpu affinity in the which-cpus selftests utility
- Picked up some r-b's

Andrew Jones (6):
RISC-V: hwprobe: Clarify cpus size parameter
RISC-V: Move the hwprobe syscall to its own file
RISC-V: hwprobe: Introduce which-cpus flag
RISC-V: selftests: Statically link hwprobe test
RISC-V: selftests: Convert hwprobe test to kselftest API
RISC-V: selftests: Add which-cpus hwprobe test

Documentation/riscv/hwprobe.rst | 27 +-
arch/riscv/include/asm/hwprobe.h | 24 ++
arch/riscv/include/uapi/asm/hwprobe.h | 3 +
arch/riscv/kernel/Makefile | 1 +
arch/riscv/kernel/sys_hwprobe.c | 361 ++++++++++++++++++
arch/riscv/kernel/sys_riscv.c | 267 -------------
arch/riscv/kernel/vdso/hwprobe.c | 74 +++-
.../testing/selftests/riscv/hwprobe/Makefile | 7 +-
.../testing/selftests/riscv/hwprobe/hwprobe.c | 64 +---
.../testing/selftests/riscv/hwprobe/hwprobe.h | 15 +
.../selftests/riscv/hwprobe/which-cpus.c | 154 ++++++++
.../selftests/riscv/vector/vstate_prctl.c | 10 +-
12 files changed, 667 insertions(+), 340 deletions(-)
create mode 100644 arch/riscv/kernel/sys_hwprobe.c
create mode 100644 tools/testing/selftests/riscv/hwprobe/hwprobe.h
create mode 100644 tools/testing/selftests/riscv/hwprobe/which-cpus.c

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2.41.0