linux-kernel - Re: [PATCH V2 05/19] irqchip: crossbar: Change allocation logic by reversing search for free irqs

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Date:	Fri, 13 Jun 2014 11:39:39 +0530
From:	Sricharan R <r.sricharan@...com>
To:	Jason Cooper <jason@...edaemon.net>
CC:	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<tony@...mide.com>, <santosh.shilimkar@...com>, <nm@...com>,
	<rnayak@...com>, <linux@....linux.org.uk>, <tglx@...utronix.de>
Subject: Re: [PATCH V2 05/19] irqchip: crossbar: Change allocation logic by
 reversing search for free irqs

Hi Jason,

On Thursday 12 June 2014 06:26 PM, Jason Cooper wrote:
> On Thu, Jun 12, 2014 at 05:23:13PM +0530, Sricharan R wrote:
>> From: Nishanth Menon <nm@...com>
>>
>> Reverse the search algorithm to ensure that address mapping and IRQ
>> allocation logics are proper. This can open up new bugs which are
>> easily fixable rather than wait till allocation logic approaches
>> the limit to find new bugs.
> 
> Could you expand on this logic some more?  What class of bugs are you
> hoping to discover more easily?
> 

class 1. address space errors -> example:
reg = <a size_b>
ti,max-irqs =  is a wrong parameter

class 2: irq-reserved list - which decides which entries in the
address space is not actually wired in

class 3: wrong list of routable-irqs.

in general allocating from max to min tends to have benefits in
ensuring the different issues that may be present in dts is easily
caught at definition time, rather than at a later point in time.


Regards,
 Sricharan
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