exit: Fix Sparse errors and warnings

This patch fixes the following sparse error:
kernel/exit.c:627:25: error: incompatible types in comparison expression

And the following warning:
kernel/exit.c:626:40: warning: incorrect type in assignment

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
[christian.brauner@ubuntu.com: edit commit message]
Link: https://lore.kernel.org/r/20200130062028.4870-1-madhuparnabhowmik10@gmail.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/kernel/exit.c b/kernel/exit.c
index 2833ffb..0b81b26 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -619,8 +619,8 @@ static void forget_original_parent(struct task_struct *father,
        reaper = find_new_reaper(father, reaper);
        list_for_each_entry(p, &father->children, sibling) {
                for_each_thread(p, t) {
-                       t->real_parent = reaper;
-                       BUG_ON((!t->ptrace) != (t->parent == father));
+                       RCU_INIT_POINTER(t->real_parent, reaper);
+                       BUG_ON((!t->ptrace) != (rcu_access_pointer(t->parent) == father));
                        if (likely(!t->ptrace))
                                t->parent = t->real_parent;
                        if (t->pdeath_signal)