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

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Message-ID: <8FED46E8A9CA574792FC7AACAC38FE7701E6EA157E@PDSMSX501.ccr.corp.intel.com>
Date:	Fri, 17 Jul 2009 10:16:55 +0800
From:	"Lu, Guanqun" <guanqun.lu@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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'

>-----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.

Guanqun

>
>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;
>>  	}

Download attachment "0002-add-IRQF_NO_SUSPEND-for-bind_ipi_to_irqhandler.patch" of type "application/octet-stream" (882 bytes)