linux-kernel - Re: [PATCH] ARM: Add support for LPAE style CONTEXTIDR

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Message-ID: <51C8627A.5000106@codeaurora.org>
Date:	Mon, 24 Jun 2013 11:15:06 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Will Deacon <will.deacon@....com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Nicolas Pitre <nico@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: Add support for LPAE style CONTEXTIDR

On 06/24/2013 10:53 AM, Will Deacon wrote:
> On Mon, Jun 24, 2013 at 03:39:09PM +0100, Christopher Covington wrote:
>> Hi Will,
>>
>> On 06/24/2013 10:04 AM, Will Deacon wrote:
>> [...]
>>
>>> What's the advantage of this approach, other than you get an extra byte's
>>> worth of PID?
>>
>> In my view, the real advantage is that the the PID is located where people
>> reading ARM Architecture Reference Manual are told they can find it.
> 
> Perhaps, but I'd usually expect a debugger or trace tools to do something
> with the PID, and they likely expect it to be shifted, so you can't really
> win.

But reading and implementing the architecture *is* winning! LOL. I'll file a
ticket with the architecture folks and see what they think.

Christopher

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