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

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Message-ID: <55ACE596.10709@codeaurora.org>
Date:	Mon, 20 Jul 2015 07:12:06 -0500
From:	Timur Tabi <timur@...eaurora.org>
To:	Hanjun Guo <hanjun.guo@...aro.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

Hanjun Guo wrote:
>> 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.

We had a bug in our ACPI tables that listed the GIC version as 1, and it 
failed to probe and then the kernel panicked.  It took me a while to 
figure out what was wrong, so I think it should print an error message 
that says that version X is unsupported.


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