Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Jens Axboe <axboe@kernel.dk>
To:     io-uring@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     brauner@kernel.org, arnd@arndb.de, Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 1/5] exit: abtract out should_wake helper for child_wait_callback()
Date:   Tue, 11 Jul 2023 14:43:48 -0600
Message-Id: <20230711204352.214086-2-axboe@kernel.dk>
In-Reply-To: <20230711204352.214086-1-axboe@kernel.dk>
References: <20230711204352.214086-1-axboe@kernel.dk>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Abstract out the helper that decides if we should wake up following
a wake_up() callback on our internal waitqueue.

No functional changes intended in this patch.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 kernel/exit.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index edb50b4c9972..2809dad69492 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1520,6 +1520,17 @@ static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk)
 	return 0;
 }
 
+static bool pid_child_should_wake(struct wait_opts *wo, struct task_struct *p)
+{
+	if (!eligible_pid(wo, p))
+		return false;
+
+	if ((wo->wo_flags & __WNOTHREAD) && wo->child_wait.private != p->parent)
+		return false;
+
+	return true;
+}
+
 static int child_wait_callback(wait_queue_entry_t *wait, unsigned mode,
 				int sync, void *key)
 {
@@ -1527,13 +1538,10 @@ static int child_wait_callback(wait_queue_entry_t *wait, unsigned mode,
 						child_wait);
 	struct task_struct *p = key;
 
-	if (!eligible_pid(wo, p))
-		return 0;
+	if (pid_child_should_wake(wo, p))
+		return default_wake_function(wait, mode, sync, key);
 
-	if ((wo->wo_flags & __WNOTHREAD) && wait->private != p->parent)
-		return 0;
-
-	return default_wake_function(wait, mode, sync, key);
+	return 0;
 }
 
 void __wake_up_parent(struct task_struct *p, struct task_struct *parent)
-- 
2.40.1