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:
 	}								\

quoted

+	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