linux-kernel - Re: [PATCH v3 1/3] lockdep: Make LOCKDEP_CROSSRELEASE configs all part of PROVE

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Message-ID: <20170822094251.si4c3ixzxdphtfhe@hirez.programming.kicks-ass.net>
Date:   Tue, 22 Aug 2017 11:42:51 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     Dave Chinner <david@...morbit.com>, mingo@...nel.org,
        linux-kernel@...r.kernel.org, kernel-team@....com,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Tejun Heo <tj@...nel.org>, Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH v3 1/3] lockdep: Make LOCKDEP_CROSSRELEASE configs all
 part of PROVE_LOCKING


TJ, afaict the workqueue stuff doesn't in fact use signals, right?

Should we do the below? That is, the only reason it appears to use
INTERRUPTIBLE is to avoid increasing the loadavg, and we've introduced
IDLE for that a while back:

  80ed87c8a9ca ("sched/wait: Introduce TASK_NOLOAD and TASK_IDLE")

---
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index f128b3becfe1..737a079480e8 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2249,7 +2249,7 @@ static int worker_thread(void *__worker)
 	 * event.
 	 */
 	worker_enter_idle(worker);
-	__set_current_state(TASK_INTERRUPTIBLE);
+	__set_current_state(TASK_IDLE);
 	spin_unlock_irq(&pool->lock);
 	schedule();
 	goto woke_up;
@@ -2291,7 +2291,7 @@ static int rescuer_thread(void *__rescuer)
 	 */
 	rescuer->task->flags |= PF_WQ_WORKER;
 repeat:
-	set_current_state(TASK_INTERRUPTIBLE);
+	set_current_state(TASK_IDLE);
 
 	/*
 	 * By the time the rescuer is requested to stop, the workqueue