linux-kernel - Re: [PATCH] avoid using smp_processor_id() in preemptible code (nr_iowait

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Message-ID: <20100615230541.5db5078e@infradead.org>
Date:	Tue, 15 Jun 2010 23:05:41 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Jiri Slaby <jslaby@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] avoid using smp_processor_id() in preemptible code
 (nr_iowait_cpu)

On Tue, 15 Jun 2010 19:13:03 +0300
Sergey Senozhatsky <sergey.senozhatsky@...il.com> wrote:

> 
> I've changed struct tick_sched to match passed *ts and cpu. Also
> changed "&per_cpu(tick_cpu_sched, cpu)" call to "struct tick_sched
> *tick_get_tick_sched(int cpu)" which we already have.
> 
> But I don't really like this part:
> struct tick_sched *tick_get_tick_sched(int cpu)
> {
> 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
> 	ts->cpu = cpu;
> 	^^^^^^^^^^^^^
> 	return ts;
> }
> 
> Please kindly review.


can we do this bit once, when the ts structure gets initialized?
it's not like the cpu value will ever change...


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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