linux-kernel - [PATCH 3/4] pid: change bacct_add_tsk() to use task_ppid_nr

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Message-ID: <20250810173615.GA20000@redhat.com>
Date: Sun, 10 Aug 2025 19:36:15 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Christian Brauner <brauner@...nel.org>,
	高翔 <gaoxiang17@...omi.com>
Cc: Al Viro <viro@...iv.linux.org.uk>, Mateusz Guzik <mjguzik@...il.com>,
	Xiang Gao <gxxa03070307@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] pid: change bacct_add_tsk() to use task_ppid_nr_ns()

to simplify the code.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/tsacct.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 16b283f9d831..6ea2f6363b90 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -57,12 +57,11 @@ void bacct_add_tsk(struct user_namespace *user_ns,
 	stats->ac_sched	 = tsk->policy;
 	stats->ac_pid	 = task_pid_nr_ns(tsk, pid_ns);
 	stats->ac_tgid   = task_tgid_nr_ns(tsk, pid_ns);
+	stats->ac_ppid	 = task_ppid_nr_ns(tsk, pid_ns);
 	rcu_read_lock();
 	tcred = __task_cred(tsk);
 	stats->ac_uid	 = from_kuid_munged(user_ns, tcred->uid);
 	stats->ac_gid	 = from_kgid_munged(user_ns, tcred->gid);
-	stats->ac_ppid	 = pid_alive(tsk) ?
-		task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
 	rcu_read_unlock();
 
 	task_cputime(tsk, &utime, &stime);
-- 
2.25.1.362.g51ebf55