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

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Message-ID: <20201028111221.464733855@infradead.org>
Date:   Wed, 28 Oct 2020 12:07:11 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org
Cc:     linux-kernel@...r.kernel.org, will@...nel.org, paulmck@...nel.org,
        hch@....de, axboe@...nel.dk, chris@...is-wilson.co.uk,
        davem@...emloft.net, kuba@...nel.org, fweisbec@...il.com,
        oleg@...hat.com, vincent.guittot@...aro.org, peterz@...radead.org
Subject: [PATCH v3 4/6] irq_work: Unconditionally build on SMP


Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 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 */