linux-kernel - Re: [PATCH 1/6] kthread: Add the helper macro kthread_run_on

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Date:   Thu, 21 Oct 2021 09:10:01 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Cai Huoqing <caihuoqing@...du.com>
Cc:     Bernard Metzler <bmt@...ich.ibm.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Ingo Molnar <mingo@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <rcu@...r.kernel.org>
Subject: Re: [PATCH 1/6] kthread: Add the helper macro kthread_run_on_cpu()

On Thu, 21 Oct 2021 20:01:30 +0800
Cai Huoqing <caihuoqing@...du.com> wrote:

> the helper macro kthread_run_on_cpu() inculdes

 "includes"

> kthread_create_on_cpu/wake_up_process().
> In some cases, use kthread_run_on_cpu() directly instead of
> kthread_create_on_node/kthread_bind/wake_up_process() or
> kthread_create_on_cpu/wake_up_process() or
> kthreadd_create/kthread_bind/wake_up_process() to simplify the code.
> 
> Signed-off-by: Cai Huoqing <caihuoqing@...du.com>
> ---
>  include/linux/kthread.h | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/include/linux/kthread.h b/include/linux/kthread.h
> index 346b0f269161..dfd125523aa9 100644
> --- a/include/linux/kthread.h
> +++ b/include/linux/kthread.h
> @@ -56,6 +56,28 @@ bool kthread_is_per_cpu(struct task_struct *k);
>  	__k;								   \
>  })
>  
> +/**
> + * kthread_run_on_cpu - create and wake a cpu bound thread.
> + * @threadfn: the function to run until signal_pending(current).
> + * @data: data ptr for @threadfn.
> + * @cpu: The cpu on which the thread should be bound,
> + * @namefmt: printf-style name for the thread. Format is restricted
> + *	     to "name.*%u". Code fills in cpu number.
> + *
> + * Description: Convenient wrapper for kthread_create_on_node()
> + * followed by wake_up_process().  Returns the kthread or
> + * ERR_PTR(-ENOMEM).
> + */
> +#define kthread_run_on_cpu(threadfn, data, cpu, namefmt)		  \

Why is this a macro and not a static inline function?

-- Steve

> +({									  \
> +	struct task_struct *__k						  \
> +		= kthread_create_on_cpu(threadfn, data, cpu_to_node(cpu), \
> +					namefmt);			  \
> +	if (!IS_ERR(__k))						  \
> +		wake_up_process(__k);					  \
> +	__k;								  \
> +})
> +
>  void free_kthread_struct(struct task_struct *k);
>  void kthread_bind(struct task_struct *k, unsigned int cpu);
>  void kthread_bind_mask(struct task_struct *k, const struct cpumask *mask);