linux-kernel - [PATCH 4/7] power, workqueue: remove keventd

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Message-Id: <1473967821-24363-5-git-send-email-tj@kernel.org>
Date:   Thu, 15 Sep 2016 15:30:18 -0400
From:   Tejun Heo <tj@...nel.org>
To:     torvalds@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, jiangshanlai@...il.com,
        akpm@...ux-foundation.org, kernel-team@...com,
        Tejun Heo <tj@...nel.org>, Qiao Zhou <qiaozhou@...micro.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 4/7] power, workqueue: remove keventd_up() usage

Now that workqueue can handle work item queueing/cancelling from very
early during boot, there is no need to gate cancel_delayed_work_sync()
while !keventd_up().  Remove it.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Qiao Zhou <qiaozhou@...micro.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
Hello,

This change depends on an earlier workqueue patch and is followed by a
patch to remove keventd_up().  It'd be great if it can be routed
through the wq/for-4.9 branch.

Thanks.

 kernel/power/qos.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 168ff44..97b0df7 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -482,16 +482,7 @@ void pm_qos_update_request(struct pm_qos_request *req,
 		return;
 	}
 
-	/*
-	 * This function may be called very early during boot, for example,
-	 * from of_clk_init(), where irq needs to stay disabled.
-	 * cancel_delayed_work_sync() assumes that irq is enabled on
-	 * invocation and re-enables it on return.  Avoid calling it until
-	 * workqueue is initialized.
-	 */
-	if (keventd_up())
-		cancel_delayed_work_sync(&req->work);
-
+	cancel_delayed_work_sync(&req->work);
 	__pm_qos_update_request(req, new_value);
 }
 EXPORT_SYMBOL_GPL(pm_qos_update_request);
-- 
2.7.4