linux-kernel - Re: [PATCH] genirq: Add IRQ 0 to domain debug file

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Date:	Sat, 15 Nov 2014 19:20:48 +0400
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] genirq: Add IRQ 0 to domain debug file

Hello,

2014-11-15 16:01 GMT+03:00 Jiang Liu <jiang.liu@...ux.intel.com>:
> On 2014/11/15 19:27, Dmitry Eremin-Solenikov wrote:
>> Currently irq_domain_mapping debugfs file dumps IRQ information starting
>> from IRQ 1. IRQ 0 is missing from that file. Add it to have the complete
>> picture of IRQ/domains mappings.
> Hi Dmitry,
>         For most irqdomain interfaces, they treat irq0 as invalid
> interrupt. But on x86, it's possible to use irq0 for timer. It causes
> may confusion when enabling irqdomain for x86.

I encountered with this issue when enabling IRQ domains support for
one of ARM sub-architectures.

-- 
With best wishes
Dmitry
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