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Re: [PATCH v9 0/7] ACPI: Unify CPU UID interface and fix ARM64 TPH steer-tag issue
- To: Chengwen Feng <fengchengwen@xxxxxxxxxx>
- From: Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>
- Date: Thu, 19 Mar 2026 10:58:32 +0000
- Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, "Rafael J . Wysocki" <rafael@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>, Huacai Chen <chenhuacai@xxxxxxxxxx>, "WANG Xuerui" <kernel@xxxxxxxxxx>, Paul Walmsley <pjw@xxxxxxxxxx>, "Palmer Dabbelt" <palmer@xxxxxxxxxxx>, Albert Ou <aou@xxxxxxxxxxxxxxxxx>, "Alexandre Ghiti" <alex@xxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, <x86@xxxxxxxxxx>, "H . Peter Anvin" <hpa@xxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Len Brown <lenb@xxxxxxxxxx>, Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Kees Cook <kees@xxxxxxxxxx>, Yanteng Si <si.yanteng@xxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Kai Huang <kai.huang@xxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Thomas Huth <thuth@xxxxxxxxxx>, Thorsten Blum <thorsten.blum@xxxxxxxxx>, Kevin Loughlin <kevinloughlin@xxxxxxxxxx>, Zheyun Shen <szy0127@xxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>, Xin Li <xin@xxxxxxxxx>, "Ahmed S . Darwish" <darwi@xxxxxxxxxxxxx>, Sohil Mehta <sohil.mehta@xxxxxxxxx>, Ilkka Koskinen <ilkka@xxxxxxxxxxxxxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, James Clark <james.clark@xxxxxxxxxx>, Besar Wicaksono <bwicaksono@xxxxxxxxxx>, Ma Ke <make24@xxxxxxxxxxx>, "Wei Huang" <wei.huang2@xxxxxxx>, Andy Gospodarek <andrew.gospodarek@xxxxxxxxxxxx>, Somnath Kotur <somnath.kotur@xxxxxxxxxxxx>, <punit.agrawal@xxxxxxxxxxxxxxxx>, <guohanjun@xxxxxxxxxx>, <suzuki.poulose@xxxxxxx>, <ryan.roberts@xxxxxxx>, <chenl311@xxxxxxxxxxxxxxx>, <masahiroy@xxxxxxxxxx>, <wangyuquan1236@xxxxxxxxxxxxxx>, <anshuman.khandual@xxxxxxx>, <heinrich.schuchardt@xxxxxxxxxxxxx>, <Eric.VanTassell@xxxxxxx>, <wangzhou1@xxxxxxxxxxxxx>, <wanghuiqiang@xxxxxxxxxx>, <liuyonglong@xxxxxxxxxx>, <linux-pci@xxxxxxxxxxxxxxx>, <linux-doc@xxxxxxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, <loongarch@xxxxxxxxxxxxxxx>, <linux-riscv@xxxxxxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>, <linux-acpi@xxxxxxxxxxxxxxx>, <linux-perf-users@xxxxxxxxxxxxxxx>, <stable@xxxxxxxxxxxxxxx>
- Delivery-date: Thu, 19 Mar 2026 10:58:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu, 19 Mar 2026 14:57:28 +0800
Chengwen Feng <fengchengwen@xxxxxxxxxx> wrote:
> This patchset unifies ACPI Processor UID retrieval across
> arm64/loongarch/riscv/x86 via acpi_get_cpu_uid() (with input validation)
> and fixes ARM64 CPU steer-tag retrieval failure in PCI/TPH:
>
> 1-4: Add acpi_get_cpu_uid() for arm64/loongarch/riscv/x86 (update
> respective users)
> 5: Centralize acpi_get_cpu_uid() declaration in include/linux/acpi.h
> 6: Clean up ACPI/PPTT and remove unused get_acpi_id_for_cpu()
> 7: Fix ARM64 platform CPU steer-tag retrieval failure
>
> The interface refactor ensures consistent CPU UID retrieval across
> architectures (no functional changes for valid inputs) and provides the
> unified interface required for the ARM64 TPH fix.
Given the structure of the series has slowly evolved since I gave
tags, I took another look. All looks good to me.
Nice work.
Jonathan
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