linux-kernel - [PATCH] exit.c: Fix Sparse errors and warnings

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Date:   Thu, 30 Jan 2020 11:50:28 +0530
From:   madhuparnabhowmik10@...il.com
To:     peterz@...radead.org, mingo@...nel.org, oleg@...hat.com,
        christian.brauner@...ntu.com, paulmck@...nel.org
Cc:     linux-kernel@...r.kernel.org, joel@...lfernandes.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        rcu@...r.kernel.org,
        Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Subject: [PATCH] exit.c: Fix Sparse errors and warnings

From: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>

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@...il.com>
---
 kernel/exit.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index bcbd59888e67..daf827a4aa25 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -623,8 +623,8 @@ 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)
-- 
2.17.1