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

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Message-ID: <20201028133420.GD229044@lothringen>
Date:   Wed, 28 Oct 2020 14:34:20 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, 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
Subject: Re: [PATCH v3 4/6] irq_work: Unconditionally build on SMP

On Wed, Oct 28, 2020 at 12:07:11PM +0100, Peter Zijlstra wrote:

This may need a changelog :-)

> 
> 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 */
> 
>