linux-kernel - Re: test for "spurious" IRQ ignores possible IRQ_WAKE

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Date:	Thu, 17 Sep 2009 23:34:16 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"Robert P. J. Day" <rpjday@...shcourse.ca>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: test for "spurious" IRQ ignores possible IRQ_WAKE_THREAD value

[Robert P. J. Day - Mon, Sep 14, 2009 at 04:34:48PM -0400]
| On Mon, 14 Sep 2009, Robert P. J. Day wrote:
| 
| >   never ashamed to embarrass myself in public, i just noticed the
| > following.  from kernel/irq/spurious.c:
| >
| > ...
| > static void
| > __report_bad_irq(unsigned int irq, struct irq_desc *desc,
| >                  irqreturn_t action_ret)
| > {
| >         struct irqaction *action;
| >
| >         if (action_ret != IRQ_HANDLED && action_ret != IRQ_NONE) {
| >                 printk(KERN_ERR "irq event %d: bogus return value %x\n",
| >                                 irq, action_ret);
| >
| >   but from include/linux/irqreturn.h, we see *three* possible return
| > values:
| >
| > enum irqreturn {
| >         IRQ_NONE,
| >         IRQ_HANDLED,
| >         IRQ_WAKE_THREAD,
| > };
| >
| > typedef enum irqreturn irqreturn_t;
| > #define IRQ_RETVAL(x)   ((x) != IRQ_NONE)
| >
| >   is there an inconsistency here?
| 
...

Hi Robert,

It could that IRQ_WAKE_THREAD is just missed here. I suppose it
was brough there as thread irq merged. But I think only Thomas
know for sure, I definitely miss something :) CC'ed
 
	-- Cyrill
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