1 files changed, 19 insertions, 0 deletions

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 39a222e094af..c421512ca5eb 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2123,6 +2123,25 @@ void default_init_apic_ldr(void)
         apic_write(APIC_LDR, val);
 }
 
+int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
+                                   const struct cpumask *andmask,
+                                   unsigned int *apicid)
+{
+        unsigned int cpu;
+
+        for_each_cpu_and(cpu, cpumask, andmask) {
+                if (cpumask_test_cpu(cpu, cpu_online_mask))
+                        break;
+        }
+
+        if (likely(cpu < nr_cpu_ids)) {
+                *apicid = per_cpu(x86_cpu_to_apicid, cpu);
+                return 0;
+        }
+
+        return -EINVAL;
+}
+
 /*
  * Power management
  */