linux-kernel - Re: [PATCH rcu] Remove unused code originally used for context tracking

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Message-ID: <20130107173906.GL2525@linux.vnet.ibm.com>
Date:	Mon, 7 Jan 2013 09:39:06 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Li Zhong <zhong@...ux.vnet.ibm.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Gilad.Ben-Yossef.gilad@...yossef.com
Subject: Re: [PATCH rcu] Remove unused code originally used for context
 tracking

On Fri, Nov 30, 2012 at 02:19:22PM +0800, Li Zhong wrote:
> As new context tracking subsystem added, it seems ignore_user_qs and
> in_user defined in struct rcu_dynticks are no longer needed, so remove
> them. 
> 
> Signed-off-by: Li Zhong <zhong@...ux.vnet.ibm.com>

Hearing no objections from  Frederic, I have queued this patch for 3.9

							Thanx, Paul

> ---
>  kernel/rcutree.c | 3 ---
>  kernel/rcutree.h | 4 ----
>  2 files changed, 7 deletions(-)
> 
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index e441b77..b8fae5d 100644
> --- a/kernel/rcutree.c
> +++ b/kernel/rcutree.c
> @@ -2719,9 +2719,6 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
>  	rdp->dynticks = &per_cpu(rcu_dynticks, cpu);
>  	WARN_ON_ONCE(rdp->dynticks->dynticks_nesting != DYNTICK_TASK_EXIT_IDLE);
>  	WARN_ON_ONCE(atomic_read(&rdp->dynticks->dynticks) != 1);
> -#ifdef CONFIG_RCU_USER_QS
> -	WARN_ON_ONCE(rdp->dynticks->in_user);
> -#endif
>  	rdp->cpu = cpu;
>  	rdp->rsp = rsp;
>  	rcu_boot_init_nocb_percpu_data(rdp);
> diff --git a/kernel/rcutree.h b/kernel/rcutree.h
> index 4b69291..6f21f2e 100644
> --- a/kernel/rcutree.h
> +++ b/kernel/rcutree.h
> @@ -102,10 +102,6 @@ struct rcu_dynticks {
>  				    /* idle-period nonlazy_posted snapshot. */
>  	int tick_nohz_enabled_snap; /* Previously seen value from sysfs. */
>  #endif /* #ifdef CONFIG_RCU_FAST_NO_HZ */
> -#ifdef CONFIG_RCU_USER_QS
> -	bool ignore_user_qs;	    /* Treat userspace as extended QS or not */
> -	bool in_user;		    /* Is the CPU in userland from RCU POV? */
> -#endif
>  };
> 
>  /* RCU's kthread states for tracing. */
> -- 
> 1.7.11.4
> 
> 

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