x86/apic: Factor out default cpu_mask_to_apicid() operations

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120605112340.GA11454@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 39a222e094af..96a2608252f1 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2123,6 +2123,34 @@ void default_init_apic_ldr(void)
         apic_write(APIC_LDR, val);
 }
 
+unsigned int default_cpu_mask_to_apicid(const struct cpumask *cpumask)
+{
+        int cpu;
+
+        /*
+         * We're using fixed IRQ delivery, can only return one phys APIC ID.
+         * May as well be the first.
+         */
+        cpu = cpumask_first(cpumask);
+        if (likely((unsigned)cpu < nr_cpu_ids))
+                return per_cpu(x86_cpu_to_apicid, cpu);
+
+        return BAD_APICID;
+}
+
+unsigned int
+default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
+                               const struct cpumask *andmask)
+{
+        int cpu;
+
+        for_each_cpu_and(cpu, cpumask, andmask) {
+                if (cpumask_test_cpu(cpu, cpu_online_mask))
+                        break;
+        }
+        return per_cpu(x86_cpu_to_apicid, cpu);
+}
+
 /*
  * Power management
  */