linux-kernel - Re: [PATCH tip/core/rcu 15/23] rcu: Make rcutree module parameters visible in sysfs

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Date:	Mon, 3 Sep 2012 02:32:28 -0700
From:	Josh Triplett <josh@...htriplett.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, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu, patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 15/23] rcu: Make rcutree module parameters
 visible in sysfs

On Thu, Aug 30, 2012 at 11:18:30AM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> 
> The module parameters blimit, qhimark, and qlomark (and more
> recently, rcu_fanout_leaf) have permission masks of zero, so
> that their values are not visible from sysfs.  This is unnecessary
> and inconvenient to administrators who might like an easy way to
> see what these values are on a running system.  This commit therefore
> sets their permission masks to 0444, allowing them to be read but
> not written.
> 
> Reported-by: Rusty Russell <rusty@...abs.org>
> Reported-by: Josh Triplett <josh@...htriplett.org>
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Reviewed-by: Josh Triplett <josh@...htriplett.org>

>  kernel/rcutree.c |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index 1d33240..55f20fd 100644
> --- a/kernel/rcutree.c
> +++ b/kernel/rcutree.c
> @@ -88,7 +88,7 @@ LIST_HEAD(rcu_struct_flavors);
>  
>  /* Increase (but not decrease) the CONFIG_RCU_FANOUT_LEAF at boot time. */
>  static int rcu_fanout_leaf = CONFIG_RCU_FANOUT_LEAF;
> -module_param(rcu_fanout_leaf, int, 0);
> +module_param(rcu_fanout_leaf, int, 0444);
>  int rcu_num_lvls __read_mostly = RCU_NUM_LVLS;
>  static int num_rcu_lvl[] = {  /* Number of rcu_nodes at specified level. */
>  	NUM_RCU_LVL_0,
> @@ -216,9 +216,9 @@ static int blimit = 10;		/* Maximum callbacks per rcu_do_batch. */
>  static int qhimark = 10000;	/* If this many pending, ignore blimit. */
>  static int qlowmark = 100;	/* Once only this many pending, use blimit. */
>  
> -module_param(blimit, int, 0);
> -module_param(qhimark, int, 0);
> -module_param(qlowmark, int, 0);
> +module_param(blimit, int, 0444);
> +module_param(qhimark, int, 0444);
> +module_param(qlowmark, int, 0444);
>  
>  int rcu_cpu_stall_suppress __read_mostly; /* 1 = suppress stall warnings. */
>  int rcu_cpu_stall_timeout __read_mostly = CONFIG_RCU_CPU_STALL_TIMEOUT;
> -- 
> 1.7.8
> 
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