linux-kernel - Re: [PATCH] xen: clear IRQ_NOAUTOEN and IRQ

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Date:	Tue, 30 Apr 2013 16:15:31 +0100
From:	Julien Grall <julien.grall@...aro.org>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"patches@...aro.org" <patches@...aro.org>
Subject: Re: [PATCH] xen: clear IRQ_NOAUTOEN and IRQ_NOREQUEST when a VIRQ
 is bound

On 04/30/2013 04:02 PM, Stefano Stabellini wrote:

> On Mon, 29 Apr 2013, Julien Grall wrote:
>> Reset the IRQ_NOAUTOEN and IRQ_NOREQUEST flags that are enabled by
>> default on ARM. If IRQ_NOAUTOEN is set, __setup_irq doesn't call
>> irq_startup, that is responsible for calling irq_unmask at startup time.
>> As a result event channels remain masked.
>>
>> The clear is already made in bind_evtchn_to_irq with commit a8636c0 but was
>> missing in bind_virq_to_irq.
>>
>> Signed-off-by: Julien Grall <julien.grall@...aro.org>
> 
> As in the original commit, you should point out that this change does
> not have any effects on x86 (where IRQ_NOREQUEST and IRQ_NOAUTOEN are
> cleared by default).
> 
> At this point we might as well do this consistently everywhere we
> allocate a new evtchn irq, including pirqs and ipis, even though we don't
> actually use them on ARM.
> 
> If the call to irq_clear_status_flags can be moved earlier, a good place
> for it could be xen_irq_init.


Thanks for the review. I will give a try and send a version with it if
the solution works.

-- 
Julien
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