[RFC][PATCH 08/10] Task watchers v2 Register lockdep task watcher

[Matt Helsley <matthltc@us.ibm.com>]

[-- Attachment #1: task-watchers-register-lockdep --]
[-- Type: text/plain, Size: 1652 bytes --]

Register a task watcher for lockdep instead of hooking into copy_process().

Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
---
 kernel/fork.c    |    5 -----
 kernel/lockdep.c |    9 +++++++++
 2 files changed, 9 insertions(+), 5 deletions(-)

Index: linux-2.6.18-mm1/kernel/fork.c
===================================================================
--- linux-2.6.18-mm1.orig/kernel/fork.c
+++ linux-2.6.18-mm1/kernel/fork.c
@@ -1058,15 +1058,10 @@ static struct task_struct *copy_process(
 		p->tgid = current->tgid;
 
 	retval = notify_task_watchers(WATCH_TASK_INIT, clone_flags, p);
 	if (retval < 0)
 		goto bad_fork_cleanup_delays_binfmt;
-#ifdef CONFIG_LOCKDEP
-	p->lockdep_depth = 0; /* no locks held yet */
-	p->curr_chain_key = 0;
-	p->lockdep_recursion = 0;
-#endif
 
 	rt_mutex_init_task(p);
 
 #ifdef CONFIG_DEBUG_MUTEXES
 	p->blocked_on = NULL; /* not blocked yet */
Index: linux-2.6.18-mm1/kernel/lockdep.c
===================================================================
--- linux-2.6.18-mm1.orig/kernel/lockdep.c
+++ linux-2.6.18-mm1/kernel/lockdep.c
@@ -2555,10 +2555,19 @@ void __init lockdep_init(void)
 		INIT_LIST_HEAD(chainhash_table + i);
 
 	lockdep_initialized = 1;
 }
 
+static int init_task_lockdep(unsigned long clone_flags, struct task_struct *p)
+{
+	p->lockdep_depth = 0; /* no locks held yet */
+	p->curr_chain_key = 0;
+	p->lockdep_recursion = 0;
+	return 0;
+}
+task_watcher_func(init, init_task_lockdep);
+
 void __init lockdep_info(void)
 {
 	printk("Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar\n");
 
 	printk("... MAX_LOCKDEP_SUBCLASSES:    %lu\n", MAX_LOCKDEP_SUBCLASSES);

--