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    Subject[RFC][PATCH 08/10] Task watchers v2 Register lockdep task watcher
    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);
    --
    -
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