linux-kernel - Re: [PATCH v3 2/8] ACPI / irqchip: Add self-probe infrastructure to initialize IRQ controller

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Date:	Mon, 20 Jul 2015 17:32:18 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Timur Tabi <timur@...eaurora.org>
CC:	Marc Zyngier <marc.zyngier@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Wei Huang <wei@...hat.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Arnd Bergmann <arnd@...db.de>, linaro-acpi@...ts.linaro.org,
	lkml <linux-kernel@...r.kernel.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	linux-acpi@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 2/8] ACPI / irqchip: Add self-probe infrastructure
 to initialize IRQ controller

On 07/18/2015 07:15 AM, Timur Tabi wrote:
> On Fri, Jul 10, 2015 at 5:45 AM, Hanjun Guo <hanjun.guo@...aro.org> wrote:
>
>> +void __init acpi_irqchip_init(void)
>> +{
>> +       struct acpi_table_id *id;
>> +
>> +       if (acpi_disabled)
>> +               return;
>> +
>> +       if (acpi_gic_version_init())
>> +               return;
>> +
>> +       /* scan the irqchip table to match the GIC version and its driver */
>> +       for (id = __irqchip_acpi_table; id->id[0]; id++) {
>> +               if (gic_version == (u8)id->driver_data)
>> +                       acpi_table_parse(id->id,
>> +                                        (acpi_tbl_table_handler)id->handler);
>> +       }
>
> Should we display an error message if we don't find a matching table?
> That can happen if the ACPI tables shows a GIC version number that is
> not listed in __irqchip_acpi_table[]?

Hmm, did you get the error message like: "Invalid GIC version 5 in
MADT"? or just use ACPI_MADT_GIC_VERSION_V1 as the gic_version? if
the later one, it will show everything is fine, but failed to probe
the GIC.

I agree with you that we need to print some error message here,
I will update my patch.

Thanks
Hanjun
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