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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-07-01 15:42:33 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-09-23 07:41:55 -0700
commit7e5c2dfb4de15e21f62c956ec32cda9372ca993b (patch)
tree0abd7beba01a6b7f61d9c9879bf397d138eefe0b /kernel
parentd40011f601b450396104de42c631981502946cf0 (diff)
rcu: Make rcutree module parameters visible in sysfs
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@ozlabs.org> Reported-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/rcutree.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index c0d3d56f040..f91a20c652b 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;