linux-kernel - [PATCH] remove the no longer needed pid_alive() check in __task_pid_nr

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Message-ID: <20200421101904.GA9358@redhat.com>
Date:   Tue, 21 Apr 2020 12:19:04 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     linux-kernel@...r.kernel.org,
        Christof Meerwald <cmeerw@...erw.org>,
        Linux Containers <containers@...ts.linux-foundation.org>
Subject: [PATCH] remove the no longer needed pid_alive() check in
 __task_pid_nr_ns()

Starting from 2c4704756cab ("pids: Move the pgrp and session pid pointers
from task_struct to signal_struct") __task_pid_nr_ns() doesn't dereference
task->group_leader, we can remove the pid_alive() check.

pid_nr_ns() has to check pid != NULL anyway, pid_alive() just adds the
unnecessary confusion.

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

diff --git a/kernel/pid.c b/kernel/pid.c
index bc21c0fb26d8..47221db038e2 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -475,8 +475,7 @@ pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
 	rcu_read_lock();
 	if (!ns)
 		ns = task_active_pid_ns(current);
-	if (likely(pid_alive(task)))
-		nr = pid_nr_ns(rcu_dereference(*task_pid_ptr(task, type)), ns);
+	nr = pid_nr_ns(rcu_dereference(*task_pid_ptr(task, type)), ns);
 	rcu_read_unlock();
 
 	return nr;
-- 
2.25.1.362.g51ebf55