4 files changed, 22 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 07fa222f0c52..84132eddb5a8 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -56,6 +56,7 @@
 #include <asm/hypervisor.h>
 #include <asm/cpu_device_id.h>
 #include <asm/intel-family.h>
+#include <asm/irq_regs.h>
 
 unsigned int num_processors;
 
@@ -2192,6 +2193,23 @@ static int cpuid_to_apicid[] = {
 	[0 ... NR_CPUS - 1] = -1,
 };
 
+#ifdef CONFIG_SMP
+/**
+ * apic_id_is_primary_thread - Check whether APIC ID belongs to a primary thread
+ * @id:	APIC ID to check
+ */
+bool apic_id_is_primary_thread(unsigned int apicid)
+{
+	u32 mask;
+
+	if (smp_num_siblings == 1)
+		return true;
+	/* Isolate the SMT bit(s) in the APICID and check for 0 */
+	mask = (1U << (fls(smp_num_siblings) - 1)) - 1;
+	return !(apicid & mask);
+}
+#endif
+
 /*
  * Should use this API to allocate logical CPU IDs to keep nr_logical_cpuids
  * and cpuid_to_apicid[] synchronized.
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 3982f79d2377..ff0d14cd9e82 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -33,6 +33,7 @@
 
 #include <linux/mm.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index ce503c99f5c4..72a94401f9e0 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -12,6 +12,7 @@
  */
 #include <linux/mm.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/pci.h>
 #include <linux/dmar.h>
 #include <linux/hpet.h>
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 0954315842c0..7654febd5102 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -11,6 +11,7 @@
  * published by the Free Software Foundation.
  */
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/seq_file.h>
 #include <linux/init.h>
 #include <linux/compiler.h>
@@ -412,7 +413,7 @@ static int activate_managed(struct irq_data *irqd)
 	if (WARN_ON_ONCE(cpumask_empty(vector_searchmask))) {
 		/* Something in the core code broke! Survive gracefully */
 		pr_err("Managed startup for irq %u, but no CPU\n", irqd->irq);
-		return EINVAL;
+		return -EINVAL;
 	}
 
 	ret = assign_managed_vector(irqd, vector_searchmask);