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From: Christian Brauner <christian.brauner@ubuntu.com>
To: oleg@redhat.com, linux-kernel@vger.kernel.org
Cc: aarcange@redhat.com, akpm@linux-foundation.org,
	christian@kellner.me, cyphar@cyphar.com,
	elena.reshetova@intel.com, guro@fb.com, jannh@google.com,
	ldv@altlinux.org, linux-api@vger.kernel.org,
	linux-kselftest@vger.kernel.org, mhocko@suse.com,
	mingo@kernel.org, peterz@infradead.org, shuah@kernel.org,
	tglx@linutronix.de, viro@zeniv.linux.org.uk,
	Christian Brauner <christian.brauner@ubuntu.com>
Subject: [PATCH v2 4/5] exit: use task_alive() in do_wait()
Date: Wed, 16 Oct 2019 17:36:05 +0200	[thread overview]
Message-ID: <20191016153606.2326-4-christian.brauner@ubuntu.com> (raw)
In-Reply-To: <20191016153606.2326-1-christian.brauner@ubuntu.com>

Replace hlist_empty() with the new task_alive() helper which is more
idiomatic, easier to grep for, and unifies how callers perform this check.

Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v1 */
patch not present

/* v2 */
patch introduced
---
 kernel/exit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index a46a50d67002..2bb0cbe94bda 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1457,7 +1457,7 @@ static long do_wait(struct wait_opts *wo)
 	 */
 	wo->notask_error = -ECHILD;
 	if ((wo->wo_type < PIDTYPE_MAX) &&
-	   (!wo->wo_pid || hlist_empty(&wo->wo_pid->tasks[wo->wo_type])))
+	   (!wo->wo_pid || !task_alive(wo->wo_pid, wo->wo_type)))
 		goto notask;
 
 	set_current_state(TASK_INTERRUPTIBLE);
-- 
2.23.0


  parent reply	other threads:[~2019-10-16 15:37 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-15 14:13 [PATCH 1/2] pidfd: verify task is alive when printing fdinfo Christian Brauner
2019-10-15 14:13 ` [PATCH 2/2] test: verify fdinfo for pidfd of reaped process Christian Brauner
2019-10-16 12:07   ` Christian Kellner
2019-10-15 14:43 ` [PATCH 1/2] pidfd: verify task is alive when printing fdinfo Oleg Nesterov
2019-10-15 14:56   ` Christian Brauner
2019-10-15 15:43     ` Oleg Nesterov
2019-10-16 15:36 ` [PATCH v2 1/5] " Christian Brauner
2019-10-16 15:36   ` [PATCH v2 2/5] test: verify fdinfo for pidfd of reaped process Christian Brauner
2019-10-16 15:36   ` [PATCH v2 3/5] pid: use task_alive() in __change_pid() Christian Brauner
2019-10-16 15:36   ` Christian Brauner [this message]
2019-10-16 15:36   ` [PATCH v2 5/5] pid: use task_alive() in pidfd_open() Christian Brauner
2019-10-16 16:24   ` [PATCH v2 1/5] pidfd: verify task is alive when printing fdinfo Oleg Nesterov
2019-10-16 16:31     ` Christian Brauner
2019-10-17  8:54       ` Oleg Nesterov
2019-10-17 10:18   ` [PATCH v3 1/5] pidfd: check pid has attached task in fdinfo Christian Brauner
2019-10-17 10:18     ` [PATCH v3 2/5] test: verify fdinfo for pidfd of reaped process Christian Brauner
2019-10-17 10:18     ` [PATCH v3 3/5] pid: use pid_has_task() in __change_pid() Christian Brauner
2019-10-17 10:18     ` [PATCH v3 4/5] exit: use pid_has_task() in do_wait() Christian Brauner
2019-10-17 10:18     ` [PATCH v3 5/5] pid: use pid_has_task() in pidfd_open() Christian Brauner
2019-10-18 15:05     ` [PATCH v3 1/5] pidfd: check pid has attached task in fdinfo Christian Brauner

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