linux-kernel - [tip:sched/core] irq_work: Remove BUG_ON in irq_work

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Date:	Sat, 5 Jul 2014 03:43:03 -0700
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, swarren@...dotorg.org, hpa@...or.com,
	mingo@...nel.org, torvalds@...ux-foundation.org,
	peterz@...radead.org, srivatsa.bhat@...ux.vnet.ibm.com,
	fweisbec@...il.com, tglx@...utronix.de
Subject: [tip:sched/core] irq_work: Remove BUG_ON in irq_work_run()

Commit-ID:  a77353e5eb56b6c6098bfce59aff1f449451b0b7
Gitweb:     http://git.kernel.org/tip/a77353e5eb56b6c6098bfce59aff1f449451b0b7
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed, 25 Jun 2014 07:13:07 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 5 Jul 2014 11:17:26 +0200

irq_work: Remove BUG_ON in irq_work_run()

Because of a collision with 8d056c48e486 ("CPU hotplug, smp: flush any
pending IPI callbacks before CPU offline"), which ends up calling
hotplug_cfd()->flush_smp_call_function_queue()->irq_work_run(), which
is not from IRQ context.

And since that already calls irq_work_run() from the hotplug path,
remove our entire hotplug handling.

Reported-by: Stephen Warren <swarren@...dotorg.org>
Tested-by: Stephen Warren <swarren@...dotorg.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/n/tip-busatzs2gvz4v62258agipuf@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/irq_work.c | 46 ++++------------------------------------------
 1 file changed, 4 insertions(+), 42 deletions(-)

diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 4b0a890..e6bcbe7 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -160,20 +160,14 @@ static void irq_work_run_list(struct llist_head *list)
 	}
 }
 
-static void __irq_work_run(void)
-{
-	irq_work_run_list(&__get_cpu_var(raised_list));
-	irq_work_run_list(&__get_cpu_var(lazy_list));
-}
-
 /*
- * Run the irq_work entries on this cpu. Requires to be ran from hardirq
- * context with local IRQs disabled.
+ * hotplug calls this through:
+ *  hotplug_cfd() -> flush_smp_call_function_queue()
  */
 void irq_work_run(void)
 {
-	BUG_ON(!in_irq());
-	__irq_work_run();
+	irq_work_run_list(&__get_cpu_var(raised_list));
+	irq_work_run_list(&__get_cpu_var(lazy_list));
 }
 EXPORT_SYMBOL_GPL(irq_work_run);
 
@@ -189,35 +183,3 @@ void irq_work_sync(struct irq_work *work)
 		cpu_relax();
 }
 EXPORT_SYMBOL_GPL(irq_work_sync);
-
-#ifdef CONFIG_HOTPLUG_CPU
-static int irq_work_cpu_notify(struct notifier_block *self,
-			       unsigned long action, void *hcpu)
-{
-	long cpu = (long)hcpu;
-
-	switch (action) {
-	case CPU_DYING:
-		/* Called from stop_machine */
-		if (WARN_ON_ONCE(cpu != smp_processor_id()))
-			break;
-		__irq_work_run();
-		break;
-	default:
-		break;
-	}
-	return NOTIFY_OK;
-}
-
-static struct notifier_block cpu_notify;
-
-static __init int irq_work_init_cpu_notifier(void)
-{
-	cpu_notify.notifier_call = irq_work_cpu_notify;
-	cpu_notify.priority = 0;
-	register_cpu_notifier(&cpu_notify);
-	return 0;
-}
-device_initcall(irq_work_init_cpu_notifier);
-
-#endif /* CONFIG_HOTPLUG_CPU */
--
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