linux-kernel - Re: [v4.1.10-rt10][PATCH 0/2] PCI: dra7xx/dwc: fix "WARNING: CPU: 1 PID: 82 at kernel/irq/handle.c:150 handle_irq_event

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Message-ID: <5638BAAE.6050909@linutronix.de>
Date:	Tue, 3 Nov 2015 14:46:22 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-rt-users@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Sekhar Nori <nsekhar@...com>
Subject: Re: [v4.1.10-rt10][PATCH 0/2] PCI: dra7xx/dwc: fix "WARNING: CPU: 1
 PID: 82 at kernel/irq/handle.c:150 handle_irq_event_percpu"

On 11/02/2015 08:30 PM, Grygorii Strashko wrote:
> On -RT above code will generate warnings, because driver_xx_hw_irq_handler()
> will be forced threaded (by default) and, as result, generic_handle_irq()
> will be called with IRQs enabled. To W/A this issue generic_handle_irq() can
> be surrounded by raw_spin_lock_irqsave/irqrestore(wa_lock).

and what happens without -RT if you boot threadedirqs?

Sebastian
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