linux-kernel - [PATCH 3/7] workqueue: Remove outdated comment about exceptional workers in unbind

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Date:   Tue,  7 Dec 2021 15:35:39 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>
Cc:     Lai Jiangshan <laijs@...ux.alibaba.com>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: [PATCH 3/7] workqueue: Remove outdated comment about exceptional workers in unbind_workers()

From: Lai Jiangshan <laijs@...ux.alibaba.com>

Long time before, workers are not ALL bound after CPU_ONLINE, they can
still be running in other CPUs before self rebinding.

But the commit a9ab775bcadf ("workqueue: directly restore CPU affinity
of workers from CPU_ONLINE") makes rebind_workers() bind them all.

So all workers are on the CPU before the CPU is down.

And the comment in unbind_workers() refers to the workers "which are
still executing works from before the last CPU down" is outdated.
Just removed it.

Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 kernel/workqueue.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ba8cf5f5e7fa..ad663853bb78 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4998,9 +4998,7 @@ static void unbind_workers(int cpu)
 		/*
 		 * We've blocked all attach/detach operations. Make all workers
 		 * unbound and set DISASSOCIATED.  Before this, all workers
-		 * except for the ones which are still executing works from
-		 * before the last CPU down must be on the cpu.  After
-		 * this, they may become diasporas.
+		 * must be on the cpu.  After this, they may become diasporas.
 		 */
 		for_each_pool_worker(worker, pool)
 			worker->flags |= WORKER_UNBOUND;
-- 
2.19.1.6.gb485710b