[PATCH v3 4/6] irq_work: Unconditionally build on SMP

[Peter Zijlstra]

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
 kernel/Makefile   |    1 +
 kernel/irq_work.c |    3 +++
 2 files changed, 4 insertions(+)

--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -105,6 +105,7 @@ obj-$(CONFIG_TRACE_CLOCK) += trace/
 obj-$(CONFIG_RING_BUFFER) += trace/
 obj-$(CONFIG_TRACEPOINTS) += trace/
 obj-$(CONFIG_IRQ_WORK) += irq_work.o
+obj-$(CONFIG_SMP) += irq_work.o
 obj-$(CONFIG_CPU_PM) += cpu_pm.o
 obj-$(CONFIG_BPF) += bpf/
 obj-$(CONFIG_KCSAN) += kcsan/
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -20,6 +20,7 @@
 #include <linux/smp.h>
 #include <asm/processor.h>
 
+#ifdef CONFIG_IRQ_WORK
 
 static DEFINE_PER_CPU(struct llist_head, raised_list);
 static DEFINE_PER_CPU(struct llist_head, lazy_list);
@@ -212,3 +213,5 @@ void irq_work_sync(struct irq_work *work
 		cpu_relax();
 }
 EXPORT_SYMBOL_GPL(irq_work_sync);
+
+#endif /* CONFIG_IRQ_WORK */