linux-kernel - Re: [PATCH] rcu: make dead code really dead

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Message-ID: <20100328034859.GP2343@linux.vnet.ibm.com>
Date:	Sat, 27 Mar 2010 20:48:59 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rcu: make dead code really dead

On Sun, Mar 28, 2010 at 11:15:20AM +0800, Lai Jiangshan wrote:
> 
> cleanup: make dead code really dead

Good catch!  I have queued this one up for RCU for 2.6.35.

							Thanx, Paul

> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> ---
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index e6014e1..1947c4e 100644
> --- a/kernel/rcutree.c
> +++ b/kernel/rcutree.c
> @@ -1236,11 +1236,11 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
>  		break; /* grace period idle or initializing, ignore. */
> 
>  	case RCU_SAVE_DYNTICK:
> -
> -		raw_spin_unlock(&rnp->lock);  /* irqs remain disabled */
>  		if (RCU_SIGNAL_INIT != RCU_SAVE_DYNTICK)
>  			break; /* So gcc recognizes the dead code. */
> 
> +		raw_spin_unlock(&rnp->lock);  /* irqs remain disabled */
> +
>  		/* Record dyntick-idle state. */
>  		force_qs_rnp(rsp, dyntick_save_progress_counter);
>  		raw_spin_lock(&rnp->lock);  /* irqs already disabled */
> 
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