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rcu: Simplify creating of lockdep class for root rcu_node

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Use lockdep_set_class() to simplify the code and to avoid any
additional overhead in the !LOCKDEP case.  Also move the
definition of rcu_root_class into kernel/rcutree.c, as suggested
by Lai Jiangshan.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1256577871443-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-10-26 10:24:31 -07:00 committed by Ingo Molnar
parent 4ce5b90340
commit 88b91c7ca4
1 changed files with 4 additions and 3 deletions
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7
kernel/rcutree.c
View file

@ -51,6 +51,8 @@
/* Data structures. */
static struct lock_class_key rcu_root_class;
#define RCU_STATE_INITIALIZER(name) { \
.level = { &name.node[0] }, \
.levelcnt = { \
@ -1666,8 +1668,7 @@ static void __init rcu_init_one(struct rcu_state *rsp)
cpustride *= rsp->levelspread[i];
rnp = rsp->level[i];
for (j = 0; j < rsp->levelcnt[i]; j++, rnp++) {
if (rnp != rcu_get_root(rsp))
spin_lock_init(&rnp->lock);
spin_lock_init(&rnp->lock);
rnp->gpnum = 0;
rnp->qsmask = 0;
rnp->qsmaskinit = 0;
@ -1690,7 +1691,7 @@ static void __init rcu_init_one(struct rcu_state *rsp)
INIT_LIST_HEAD(&rnp->blocked_tasks[1]);
}
}
spin_lock_init(&rcu_get_root(rsp)->lock);
lockdep_set_class(&rcu_get_root(rsp)->lock, &rcu_root_class);
}
/*