linux-kernel - Re: [PATCH 1/3] add flag IRQF_NO

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Message-Id: <200907170441.47373.rjw@sisk.pl>
Date:	Fri, 17 Jul 2009 04:41:46 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Lu, Guanqun" <guanqun.lu@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"jeremy@...p.org" <jeremy@...p.org>
Subject: Re: [PATCH 1/3] add flag IRQF_NO_SUSPEND in 'struct irqaction'

On Friday 17 July 2009, Lu, Guanqun wrote:
> >-----Original Message-----
> >From: Rafael J. Wysocki [mailto:rjw@...k.pl]
> >Sent: Friday, July 17, 2009 9:52 AM
> >To: Lu, Guanqun
> >Cc: linux-kernel@...r.kernel.org; mingo@...e.hu; jeremy@...p.org
> >Subject: Re: [PATCH 1/3] add flag IRQF_NO_SUSPEND in 'struct irqaction'
> >
> >On Friday 17 July 2009, Guanqun Lu wrote:
> >> We currently only bypass IRQF_TIMER in '__disable_irq',
> >> but Xen specific IRQs should not be disabled either.
> >> This commit adds a new flag to accompolish this goal
> >> without being mixed up with IRQF_TIMER flag.
> >
> >For some obscure reasons [2/3] didn't reach my inbox.  The other 2 patches
> >look fine to me.
> 
> I'm sending patch [2/3] via attachment in case it's lost accidentally by git-send-email again.
> Sorry for the inconvenience it may cause.

Thanks, patch looks OK to me.

Best,
Rafael


> >> Signed-off-by: Guanqun Lu <guanqun.lu@...el.com>
> >> ---
> >>  include/linux/interrupt.h |    1 +
> >>  kernel/irq/manage.c       |    3 ++-
> >>  2 files changed, 3 insertions(+), 1 deletions(-)
> >>
> >> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
> >> index 2721f07..99264c3 100644
> >> --- a/include/linux/interrupt.h
> >> +++ b/include/linux/interrupt.h
> >> @@ -58,6 +58,7 @@
> >>  #define IRQF_PERCPU		0x00000400
> >>  #define IRQF_NOBALANCING	0x00000800
> >>  #define IRQF_IRQPOLL		0x00001000
> >> +#define IRQF_NO_SUSPEND		0x00002000
> >>
> >>  /*
> >>   * Bits used by threaded handlers:
> >> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> >> index 50da676..3dc4e74 100644
> >> --- a/kernel/irq/manage.c
> >> +++ b/kernel/irq/manage.c
> >> @@ -192,7 +192,8 @@ static inline int setup_affinity(unsigned int irq, struct irq_desc
> >*desc)
> >>  void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
> >>  {
> >>  	if (suspend) {
> >> -		if (!desc->action || (desc->action->flags & IRQF_TIMER))
> >> +		if (!desc->action ||
> >> +		    (desc->action->flags & (IRQF_TIMER | IRQF_NO_SUSPEND)))
> >>  			return;
> >>  		desc->status |= IRQ_SUSPENDED;
> >>  	}
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