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Message-Id: <20240209170611.1166299-1-longman@redhat.com>
Date: Fri, 9 Feb 2024 12:06:11 -0500
From: Waiman Long <longman@...hat.com>
To: Tejun Heo <tj@...nel.org>,
Lai Jiangshan <jiangshanlai@...il.com>,
Jonathan Corbet <corbet@....net>
Cc: linux-kernel@...r.kernel.org,
Waiman Long <longman@...hat.com>
Subject: [PATCH v2] workqueue: Fix kernel-doc comment of unplug_oldest_pwq()
Fix the kernel-doc comment of the unplug_oldest_pwq() function to enable
proper processing and formatting of the embedded ASCII diagram.
Signed-off-by: Waiman Long <longman@...hat.com>
---
kernel/workqueue.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index cd2c6edc5c66..ddcdeb7b9f26 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1787,14 +1787,12 @@ static bool pwq_activate_first_inactive(struct pool_workqueue *pwq, bool fill)
}
/**
- * unplug_oldest_pwq - restart an oldest plugged pool_workqueue
- * @wq: workqueue_struct to be restarted
+ * unplug_oldest_pwq - unplug the oldest pool_workqueue
+ * @wq: workqueue_struct where its oldest pwq is to be unplugged
*
- * pwq's are linked into wq->pwqs with the oldest first. For ordered
- * workqueues, only the oldest pwq is unplugged, the others are plugged to
- * suspend execution until the oldest one is drained. When this happens, the
- * next oldest one (first plugged pwq in iteration) will be unplugged to
- * restart work item execution to ensure proper work item ordering.
+ * This function should only be called for ordered workqueues where only the
+ * oldest pwq is unplugged, the others are plugged to suspend execution to
+ * ensure proper work item ordering::
*
* dfl_pwq --------------+ [P] - plugged
* |
@@ -1804,6 +1802,11 @@ static bool pwq_activate_first_inactive(struct pool_workqueue *pwq, bool fill)
* 1 3 5
* | | |
* 2 4 6
+ *
+ * When the oldest pwq is drained and removed, this function should be called
+ * to unplug the next oldest one to start its work item execution. Note that
+ * pwq's are linked into wq->pwqs with the oldest first, so the first one in
+ * the list is the oldest.
*/
static void unplug_oldest_pwq(struct workqueue_struct *wq)
{
--
2.39.3
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