linux-kernel - Re: [PATCH v3 1/6] kthread: Add the helper function kthread_run_on

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Date:   Tue, 16 Nov 2021 16:01:50 -0500
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-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rcu@...r.kernel.org" <rcu@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 1/6] kthread: Add the helper function
 kthread_run_on_cpu()

On Tue, 26 Oct 2021 08:32:30 +0000
"Cai,Huoqing" <caihuoqing@...du.com> wrote:

> Hello,
> Just a ping, to see if there are any more comments :-P

I have no real issue with this patch set. As it seems to be a generic clean
up, perhaps Andrew might like to take a look at it, and if he's fine with
it, he can take it through his tree?

-- Steve


> > -----Original Message-----
> > From: Cai,Huoqing <caihuoqing@...du.com>
> > Sent: 2021年10月22日 10:57
> > Subject: [PATCH v3 1/6] kthread: Add the helper function kthread_run_on_cpu()
> > 
> > the helper function kthread_run_on_cpu() 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>
> > ---
> > v1->v2:
> > 	*Remove cpu_to_node from kthread_create_on_cpu params.
> > 	*Updated the macro description comment.
> > v2->v3:
> > 	*Convert this helper macro to static inline function
> > 	*Fix typo in changelog
> > 
> > v1 link:
> > 	https://lore.kernel.org/lkml/20211021120135.3003-2-
> > caihuoqing@...du.com/
> > v2 link:
> > 	https://lore.kernel.org/lkml/20211021122758.3092-2-
> > caihuoqing@...du.com/
> > 
> >  include/linux/kthread.h | 25 +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> > 
> > diff --git a/include/linux/kthread.h b/include/linux/kthread.h
> > index 346b0f269161..db47aae7c481 100644
> > --- a/include/linux/kthread.h
> > +++ b/include/linux/kthread.h
> > @@ -56,6 +56,31 @@ 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_cpu()
> > + * followed by wake_up_process().  Returns the kthread or
> > + * ERR_PTR(-ENOMEM).
> > + */
> > +static inline struct task_struct *
> > +kthread_run_on_cpu(int (*threadfn)(void *data), void *data,
> > +			unsigned int cpu, const char *namefmt)
> > +{
> > +	struct task_struct *p;
> > +
> > +	p = kthread_create_on_cpu(threadfn, data, cpu, namefmt);
> > +	if (!IS_ERR(p))
> > +		wake_up_process(p);
> > +
> > +	return p;
> > +}
> > +
> >  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);
> > --
> > 2.25.1  
>