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Wysocki" CC: Jonathan Corbet , WANG Xuerui , Thomas Gleixner , Dave Hansen , "H . Peter Anvin" , Juergen Gross , Boris Ostrovsky , Len Brown , Sunil V L , Mark Rutland , Jonathan Cameron , Kees Cook , Yanteng Si , Sean Christopherson , Kai Huang , Tom Lendacky , Thomas Huth , Thorsten Blum , Kevin Loughlin , Zheyun Shen , Peter Zijlstra , Pawan Gupta , Xin Li , "Ahmed S . Darwish" , Sohil Mehta , Ilkka Koskinen , Robin Murphy , James Clark , Besar Wicaksono , Ma Ke , Wei Huang , Andy Gospodarek , Somnath Kotur , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH RESEND v10 2/8] LoongArch: Add acpi_get_cpu_uid() for unified ACPI CPU UID retrieval Date: Wed, 1 Apr 2026 16:16:34 +0800 Message-ID: <20260401081640.26875-3-fengchengwen@huawei.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260401081640.26875-1-fengchengwen@huawei.com> References: <20260401081640.26875-1-fengchengwen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.50.163.32] X-ClientProxiedBy: kwepems200001.china.huawei.com (7.221.188.67) To kwepemk500009.china.huawei.com (7.202.194.94) X-purgate-ID: tlsNG-33051d/1775031415-CBF2DC9A-FC401EC5/0/0 X-purgate-type: clean X-purgate-size: 1483 X-ZohoMail-DKIM: pass (identity @huawei.com) X-ZM-MESSAGEID: 1775031444482154100 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" As a step towards unifying the interface for retrieving ACPI CPU UID across architectures, introduce a new function acpi_get_cpu_uid() for loongarch. While at it, add input validation to make the code more robust. Cc: stable@vger.kernel.org Signed-off-by: Chengwen Feng Reviewed-by: Jonathan Cameron --- arch/loongarch/include/asm/acpi.h | 1 + arch/loongarch/kernel/acpi.c | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/arch/loongarch/include/asm/acpi.h b/arch/loongarch/include/asm= /acpi.h index 7376840fa9f7..8bb101b4557e 100644 --- a/arch/loongarch/include/asm/acpi.h +++ b/arch/loongarch/include/asm/acpi.h @@ -44,6 +44,7 @@ static inline u32 get_acpi_id_for_cpu(unsigned int cpu) { return acpi_core_pic[cpu_logical_map(cpu)].processor_id; } +int acpi_get_cpu_uid(unsigned int cpu, u32 *uid); =20 #endif /* !CONFIG_ACPI */ =20 diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c index 1367ca759468..058f0dbe8e8f 100644 --- a/arch/loongarch/kernel/acpi.c +++ b/arch/loongarch/kernel/acpi.c @@ -385,3 +385,12 @@ int acpi_unmap_cpu(int cpu) EXPORT_SYMBOL(acpi_unmap_cpu); =20 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ + +int acpi_get_cpu_uid(unsigned int cpu, u32 *uid) +{ + if (cpu >=3D nr_cpu_ids) + return -EINVAL; + *uid =3D acpi_core_pic[cpu_logical_map(cpu)].processor_id; + return 0; +} +EXPORT_SYMBOL_GPL(acpi_get_cpu_uid); --=20 2.17.1