[PATCH v4 0/2] Fix get cpu steer-tag fail on ARM64 platform

[fengchengwen]

On 3/9/2026 6:28 PM, Jonathan Cameron wrote:
> On Mon, 9 Mar 2026 12:16:56 +0800
> Chengwen Feng <fengchengwen at huawei.com> wrote:
> 
>> 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.
> 
> Hi,
> 
> For future reference, please keep same lists +CC on every patch
> (for a small series, send everything to everyone who gets any patch).
> For me at least, that led to my filter putting patch 1 in a totally different
> place from the rest and some confusion.
> 
> Also, don't send in reply to a previous version. Just start a new email
> thread.  That both avoids deep nesting in email clients and generally
> ensures your series ends up in the right place if people are sorting
> by time of sending.

Thanks Jonathan for the reminder, v5 has been sent with all of your comments.

Thanks again

> 
> No need to resend this time unless others ask for it. 
> 
> Thanks,
> 
> Jonathan
> 
>>
>> ---
>> 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/kernel/cpu/common.c       |  8 ++++++++
>>  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 ++--
>>  12 files changed, 35 insertions(+), 24 deletions(-)
>>
>