linux-kernel - Re: [PATCH RFC tip/core/rcu 4/4] rcu: Ensure that RCU_FAST_NO

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Message-ID: <1335445496.13683.21.camel@twins>
Date:	Thu, 26 Apr 2012 15:04:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	patches@...aro.org, "Paul E. McKenney" <paul.mckenney@...aro.org>
Subject: Re: [PATCH RFC tip/core/rcu 4/4] rcu: Ensure that RCU_FAST_NO_HZ
 timers expire on correct CPU

On Mon, 2012-04-23 at 09:16 -0700, Paul E. McKenney wrote:
> -               mod_timer(&per_cpu(rcu_idle_gp_timer, cpu),
> -                         per_cpu(rcu_idle_gp_timer_expires, cpu));
> +               tp = &per_cpu(rcu_idle_gp_timer, cpu);
> +               tp->expires = per_cpu(rcu_idle_gp_timer_expires, cpu);
> +               add_timer_on(tp, cpu); 

The simpler change looks to use mod_timer_pinned()
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