linux-kernel - Re: [PATCH v3 1/4] genirq: Introduce driver-readable IRQ status word

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Message-ID: <alpine.LFD.2.00.1012142145480.12146@localhost6.localdomain6>
Date:	Tue, 14 Dec 2010 21:47:21 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jan Kiszka <jan.kiszka@....de>
cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	linux-kernel@...r.kernel.org, kvm <kvm@...r.kernel.org>,
	Tom Lyon <pugs@...co.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [PATCH v3 1/4] genirq: Introduce driver-readable IRQ status
 word

On Mon, 13 Dec 2010, Jan Kiszka wrote:
> +/**
> + *	get_irq_status - read interrupt line status word
> + *	@irq: Interrupt line of the status word
> + *
> + *	This returns the current content of the status word associated with
> + *	the given interrupt line. See IRQS_* flags for details.
> + */
> +unsigned long get_irq_status(unsigned int irq)
> +{
> +	struct irq_desc *desc = irq_to_desc(irq);
> +
> +	return desc ? desc->irq_data.drv_status : 0;
> +}
> +EXPORT_SYMBOL_GPL(get_irq_status);

We should document that this is a snapshot and in no way serialized
against modifications of drv_status. I'll fix up the kernel doc.

Thanks,

	tglx
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