linux-kernel - Re: [PATCH RT 3/9][RFC] [PATCH 3/9] lglock/rt: Use non-rt for_each

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Date:	Fri, 02 Mar 2012 09:20:48 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Carsten Emde <C.Emde@...dl.org>,
	John Kacur <jkacur@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <clark.williams@...il.com>,
	"mingo@...e.hu" <mingo@...e.hu>, Andi Kleen <ak@...ux.intel.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>
Subject: Re: [PATCH RT 3/9][RFC] [PATCH 3/9] lglock/rt: Use non-rt
 for_each_cpu() in -rt code

On Fri, 2012-03-02 at 12:55 +0530, Srivatsa S. Bhat wrote:
> On 03/02/2012 12:25 AM, Steven Rostedt wrote:
>  	}								\
> > +	register_hotcpu_notifier(&name##_lg_cpu_notifier);		\
> > +	get_online_cpus();						\
> > +	for_each_online_cpu(i)						\
> > +		cpu_set(i, name##_cpus);				\
> 
> 
> This can be further improved. We don't really need this loop. We can replace
> it with:
> 
> cpumask_copy(&name##_cpus, cpu_online_mask);
> 
> (as pointed out by Ingo. See: https://lkml.org/lkml/2012/2/29/93 and
> https://lkml.org/lkml/2012/2/29/153).
> 
> I will try sending a patch for this to non-RT after the numerous patches
> currently flying around this code (in non-RT) settle down..
> 
> 

Yeah, I thought that was funny too, but I wanted RT to be close to
mainline. My thoughts were to fix the broken hotplug code at the time
and I wasn't thinking too much on improving mainline ;-)

-- Steve


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