linux-kernel - Re: [PATCH 01/20] arm/bL_switcher: Use kthread_run_on

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Message-ID: <q8r18os4-8ss5-qq61-so7p-0np12o8q3prr@syhkavp.arg>
Date: Mon, 5 Aug 2024 10:53:45 -0400 (EDT)
From: Nicolas Pitre <nico@...xnic.net>
To: Dave Martin <Dave.Martin@....com>
cc: Frederic Weisbecker <frederic@...nel.org>, 
    LKML <linux-kernel@...r.kernel.org>, Russell King <linux@...linux.org.uk>, 
    linux-arm-kernel@...ts.infradead.org, 
    Andrew Morton <akpm@...ux-foundation.org>, 
    Peter Zijlstra <peterz@...radead.org>, 
    Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 01/20] arm/bL_switcher: Use kthread_run_on_cpu()

On Mon, 5 Aug 2024, Dave Martin wrote:

> Hi,
> 
> On Fri, Jul 26, 2024 at 11:56:37PM +0200, Frederic Weisbecker wrote:
> > Use the proper API instead of open coding it.
> > 
> > Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
> > ---
> >  arch/arm/common/bL_switcher.c | 10 ++++------
> >  1 file changed, 4 insertions(+), 6 deletions(-)
> > 
> > diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c
> > index 9a9aa53547a6..d1e82a318e3b 100644
> > --- a/arch/arm/common/bL_switcher.c
> > +++ b/arch/arm/common/bL_switcher.c
> > @@ -307,13 +307,11 @@ static struct task_struct *bL_switcher_thread_create(int cpu, void *arg)
> >  {
> >  	struct task_struct *task;
> >  
> > -	task = kthread_create_on_node(bL_switcher_thread, arg,
> > -				      cpu_to_node(cpu), "kswitcher_%d", cpu);
> > -	if (!IS_ERR(task)) {
> > -		kthread_bind(task, cpu);
> > -		wake_up_process(task);
> > -	} else
> > +	task = kthread_run_on_cpu(bL_switcher_thread, arg,
> > +				  cpu, "kswitcher_%d");
> > +	if (IS_ERR(task))
> >  		pr_err("%s failed for CPU %d\n", __func__, cpu);
> > +
> >  	return task;
> >  }
> 
> It's ages since I worked on this, but it looks like this is pure
> refactoring.  So far as I can see, it does the right thing, so, FWIW:
> 
> Reviewed-by: Dave Martin <Dave.Martin@....com>
> 
> I don't currently have hardware I can test this on, though.
> 
> Nico (Cc added) might just possibly have an opinion on it, though this
> looks uncontroversial.

No strong opinion.

Acked-by: Nicolas Pitre <nico@...xnic.net>


Nicolas