[PATCH v5 0/2] Fix get cpu steer-tag fail on ARM64 platform

Chengwen Feng
2026-03-10T03:21:19Z

This patchset addresses the issue where retrieving the CPU steer-tag
fails on ARM64 platforms. The first commit is a pure renaming of the
ACPI CPU ID retrieval interface (no functional changes), which serves
as preparation for the second commit that implements the core fix for
the steer-tag retrieval logic.

---
Changes in v5:
- Refine commit-log of commit 2/2
- Replace cpu_acpi_id() by acpi_get_cpu_acpi_id() on x86

Changes in v4:
- Split the rename into a separate commit.

Changes in v3:
- Rename existing get_acpi_id_for_cpu() to acpi_get_cpu_acpi_id() other
than add one new API.

Changes in v2:
- Add ECN _DSM reference doc name and its URL.
- Separate implement acpi_get_cpu_acpi_id() in each arch which supports
ACPI.
- Refine commit-log.

Chengwen Feng (2):
ACPI: Rename get_acpi_id_for_cpu() to acpi_get_cpu_acpi_id() on
non-x86
PCI/TPH: Fix get cpu steer-tag fail on ARM64 platform

Documentation/PCI/tph.rst | 4 ++--
arch/arm64/include/asm/acpi.h | 4 ++--
arch/loongarch/include/asm/acpi.h | 2 +-
arch/riscv/include/asm/acpi.h | 2 +-
arch/riscv/kernel/acpi_numa.c | 2 +-
arch/x86/include/asm/acpi.h | 2 ++
arch/x86/include/asm/cpu.h | 1 -
arch/x86/include/asm/smp.h | 1 -
arch/x86/kernel/cpu/common.c | 12 ++++++++++++
arch/x86/xen/enlighten_hvm.c | 4 ++--
drivers/acpi/pptt.c | 16 ++++++++--------
drivers/acpi/riscv/rhct.c | 2 +-
drivers/pci/tph.c | 11 ++++++-----
drivers/perf/arm_cspmu/arm_cspmu.c | 2 +-
include/linux/pci-tph.h | 4 ++--
15 files changed, 41 insertions(+), 28 deletions(-)

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2.17.1