h63xx: tsc2101 alsa sound support

[linux-2.6-omap-h63xx.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index fbea12d7a94378105bfa728b4c9d6e98d07d2bf3..b373322ca4977a632bed40a38de125e9db482228 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -108,8 +108,10 @@ void free_task(struct task_struct *tsk)
 }
 EXPORT_SYMBOL(free_task);
 
-void __put_task_struct(struct task_struct *tsk)
+void __put_task_struct_cb(struct rcu_head *rhp)
 {
+       struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
+
        WARN_ON(!(tsk->exit_state & (EXIT_DEAD | EXIT_ZOMBIE)));
        WARN_ON(atomic_read(&tsk->usage));
        WARN_ON(tsk == current);
@@ -1059,6 +1061,12 @@ static task_t *copy_process(unsigned long clone_flags,
         */
        p->clear_child_tid = (clone_flags & CLONE_CHILD_CLEARTID) ? child_tidptr: NULL;
 
+       /*
+        * sigaltstack should be cleared when sharing the same VM
+        */
+       if ((clone_flags & (CLONE_VM|CLONE_VFORK)) == CLONE_VM)
+               p->sas_ss_sp = p->sas_ss_size = 0;
+
        /*
         * Syscall tracing should be turned off in the child regardless
         * of CLONE_PTRACE.
@@ -1470,9 +1478,7 @@ static int unshare_vm(unsigned long unshare_flags, struct mm_struct **new_mmp)
 
        if ((unshare_flags & CLONE_VM) &&
            (mm && atomic_read(&mm->mm_users) > 1)) {
-               *new_mmp = dup_mm(current);
-               if (!*new_mmp)
-                       return -ENOMEM;
+               return -EINVAL;
        }
 
        return 0;
@@ -1561,7 +1567,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
 
                if (new_sigh) {
                        sigh = current->sighand;
-                       current->sighand = new_sigh;
+                       rcu_assign_pointer(current->sighand, new_sigh);
                        new_sigh = sigh;
                }