rcu: Create directory for each flavor of rcu

This patch will create subdirectory according to each flavor of rcu, the new
structure will be:

	/debugfs/rcu/ -> rsp_0
		      -> rsp_1
		      -> ...

So we can go to '/debugfs/rcu/rsp_0' and get the cpu info of rsp_0 there.
The flavors of RCU are currently rcu_bh, rcu_preempt, and rcu_sched.

Signed-off-by: Michael Wang <wangyun@linux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index 693513bc50e6..62223a27f985 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -446,12 +446,20 @@ static struct dentry *rcudir;
 
 static int __init rcutree_trace_init(void)
 {
+        struct rcu_state *rsp;
         struct dentry *retval;
+        struct dentry *rspdir;
 
         rcudir = debugfs_create_dir("rcu", NULL);
         if (!rcudir)
                 goto free_out;
 
+        for_each_rcu_flavor(rsp) {
+                rspdir = debugfs_create_dir(rsp->name, rcudir);
+                if (!rspdir)
+                        goto free_out;
+        }
+
         retval = debugfs_create_file("rcubarrier", 0444, rcudir,
                                                 NULL, &rcubarrier_fops);
         if (!retval)