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

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Message-Id: <200907170352.11749.rjw@sisk.pl>
Date:	Fri, 17 Jul 2009 03:52:11 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Guanqun Lu <guanqun.lu@...el.com>
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.

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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