[PATCH] RCU signal handling

[~andy/linux] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index 1c1cf8dc396be6ddebca4c663a9eb234d56cb0cc..7fe3adfa65cb54025eda3093be23086a876435d4 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -743,6 +743,14 @@ int unshare_files(void)
 
 EXPORT_SYMBOL(unshare_files);
 
+void sighand_free_cb(struct rcu_head *rhp)
+{
+       struct sighand_struct *sp;
+
+       sp = container_of(rhp, struct sighand_struct, rcu);
+       kmem_cache_free(sighand_cachep, sp);
+}
+
 static inline int copy_sighand(unsigned long clone_flags, struct task_struct * tsk)
 {
        struct sighand_struct *sig;
@@ -752,7 +760,7 @@ static inline int copy_sighand(unsigned long clone_flags, struct task_struct * t
                return 0;
        }
        sig = kmem_cache_alloc(sighand_cachep, GFP_KERNEL);
-       tsk->sighand = sig;
+       rcu_assign_pointer(tsk->sighand, sig);
        if (!sig)
                return -ENOMEM;
        spin_lock_init(&sig->siglock);
@@ -1124,8 +1132,6 @@ static task_t *copy_process(unsigned long clone_flags,
        if (unlikely(p->ptrace & PT_PTRACED))
                __ptrace_link(p, current->parent);
 
-       cpuset_fork(p);
-
        attach_pid(p, PIDTYPE_PID, p->pid);
        attach_pid(p, PIDTYPE_TGID, p->tgid);
        if (thread_group_leader(p)) {
@@ -1135,13 +1141,14 @@ static task_t *copy_process(unsigned long clone_flags,
                        __get_cpu_var(process_counts)++;
        }
 
-       proc_fork_connector(p);
        if (!current->signal->tty && p->signal->tty)
                p->signal->tty = NULL;
 
        nr_threads++;
        total_forks++;
        write_unlock_irq(&tasklist_lock);
+       proc_fork_connector(p);
+       cpuset_fork(p);
        retval = 0;
 
 fork_out: