x86/apic: Use a proper define for invalid ACPI CPU ID

The ACPI ID for CPUs is preset with U32_MAX which is completely non
obvious. Use a proper define for it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Link: https://lore.kernel.org/r/20240212154640.177504138@linutronix.de

arch/x86/include/asm/apic.h

@@ -48,7 +48,10 @@ static inline void x86_32_probe_apic(void) { }
 
 extern u32 cpuid_to_apicid[];
 
+#define CPU_ACPIID_INVALID	U32_MAX
+
 #ifdef CONFIG_X86_LOCAL_APIC
+
 extern int apic_verbosity;
 extern int local_apic_timer_c2_ok;
 

arch/x86/kernel/apic/apic.c

@@ -111,7 +111,7 @@ static inline bool apic_accessible(void)
  * Map cpu index to physical APIC ID
  */
 DEFINE_EARLY_PER_CPU_READ_MOSTLY(u32, x86_cpu_to_apicid, BAD_APICID);
-DEFINE_EARLY_PER_CPU_READ_MOSTLY(u32, x86_cpu_to_acpiid, U32_MAX);
+DEFINE_EARLY_PER_CPU_READ_MOSTLY(u32, x86_cpu_to_acpiid, CPU_ACPIID_INVALID);
 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_acpiid);
 

arch/x86/xen/enlighten_hvm.c

@@ -168,7 +168,7 @@ static int xen_cpu_up_prepare_hvm(unsigned int cpu)
 	 */
 	xen_uninit_lock_cpu(cpu);
 
-	if (cpu_acpi_id(cpu) != U32_MAX)
+	if (cpu_acpi_id(cpu) != CPU_ACPIID_INVALID)
 		per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
 	else
 		per_cpu(xen_vcpu_id, cpu) = cpu;