Re: [PATCH v9 4/7] x86/acpi: Add acpi_get_cpu_uid() implementation and update Xen users

[kernel test robot <lkp@intel.com>]

Hi Chengwen,

kernel test robot noticed the following build errors:

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on tip/x86/core pci/next pci/for-linus linus/master v7.0-rc4 next-20260320]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Chengwen-Feng/arm64-acpi-Add-acpi_get_cpu_uid-and-switch-arm_cspmu-to-use-it/20260320-194713
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
patch link:    https://lore.kernel.org/r/20260319065735.45954-5-fengchengwen%40huawei.com
patch subject: [PATCH v9 4/7] x86/acpi: Add acpi_get_cpu_uid() implementation and update Xen users
config: x86_64-buildonly-randconfig-005-20260321 (https://download.01.org/0day-ci/archive/20260321/202603210907.zP8613EA-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260321/202603210907.zP8613EA-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603210907.zP8613EA-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/xen/enlighten_hvm.c:165:6: error: call to undeclared function 'acpi_get_cpu_uid'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     165 |         if (acpi_get_cpu_uid(cpu, &cpu_uid) == 0)
         |             ^
   1 error generated.


vim +/acpi_get_cpu_uid +165 arch/x86/xen/enlighten_hvm.c

   151	
   152	static int xen_cpu_up_prepare_hvm(unsigned int cpu)
   153	{
   154		u32 cpu_uid;
   155		int rc = 0;
   156	
   157		/*
   158		 * If a CPU was offlined earlier and offlining timed out then the
   159		 * lock mechanism is still initialized. Uninit it unconditionally
   160		 * as it's safe to call even if already uninited. Interrupts and
   161		 * timer have already been handled in xen_cpu_dead_hvm().
   162		 */
   163		xen_uninit_lock_cpu(cpu);
   164	
 > 165		if (acpi_get_cpu_uid(cpu, &cpu_uid) == 0)
   166			per_cpu(xen_vcpu_id, cpu) = cpu_uid;
   167		else
   168			per_cpu(xen_vcpu_id, cpu) = cpu;
   169		xen_vcpu_setup(cpu);
   170		if (!xen_have_vector_callback)
   171			return 0;
   172	
   173		if (xen_percpu_upcall) {
   174			rc = xen_set_upcall_vector(cpu);
   175			if (rc) {
   176				WARN(1, "HVMOP_set_evtchn_upcall_vector"
   177				     " for CPU %d failed: %d\n", cpu, rc);
   178				return rc;
   179			}
   180		}
   181	
   182		if (xen_feature(XENFEAT_hvm_safe_pvclock))
   183			xen_setup_timer(cpu);
   184	
   185		rc = xen_smp_intr_init(cpu);
   186		if (rc) {
   187			WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
   188			     cpu, rc);
   189		}
   190		return rc;
   191	}
   192	

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