linux-kernel - Re: [UPDATED PATCH 21/27] sparc32, smpboot: Use generic SMP booting infrastructure

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Message-ID: <4FCA40A5.3060409@linux.vnet.ibm.com>
Date:	Sat, 02 Jun 2012 22:04:45 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	David Miller <davem@...emloft.net>, tglx@...utronix.de,
	peterz@...radead.org, paulmck@...ux.vnet.ibm.com,
	rusty@...tcorp.com.au, mingo@...nel.org, yong.zhang0@...il.com,
	akpm@...ux-foundation.org, vatsa@...ux.vnet.ibm.com, rjw@...k.pl,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	nikunj@...ux.vnet.ibm.com, vapier@...too.org, konrad@...sler.com,
	tkhai@...dex.ru, sparclinux@...r.kernel.org
Subject: Re: [UPDATED PATCH 21/27] sparc32, smpboot: Use generic SMP	booting
 infrastructure

On 06/02/2012 09:53 PM, Sam Ravnborg wrote:

>>
>> As I mentioned in my other mail, I am thinking of changing them to
>> arch_cpu_pre_starting(), arch_cpu_pre_online() and arch_cpu_post_online().
>> Let me know what you think of those names.
> Much better than "__" - so if none of the guys that excel in core
> code objects go for that.
> 


Ok..

>> Would you kindly add a changelog and your sign-off to this patch?
> Will do in next revision.
> 


Great!

> ...
> 
> Thanks for the throughfull review.
> I will address all points - including passing the pointer down,
> as I assume you have some future plans with that pointer.
> 
>>
>> I still didn't get how this solves the original problem of
>> not having sparc_cpu_model set to sparc_leon. You mentioned
>> that by the time we reach leon_smp_cpu_startup, that variable
>> is not set. Even inside leon_smp_cpu_startup, I don't immediately
>> see where it is set. Am I missing something?
> 
> After looking more closely at the code it is my understanding
> that a leon CPU when started will actually jump to the reset
> vector and start from there.
> So the secondary CPU's will run long time after
> sparc_cpu_model is set so we can safely use it.
> 
> The sun based cpu will in comparsion jump to
> an address supplied to a prom call - so they do not
> jump to the reset vector.
> But they also have sparc_cpu_model set so no problem there
> either.
> 


Ok..

> All this are my deductions from reading the code - but this
> is not an area I have looked at otherwise..
> 
> I may not find time today to cook up a new version of
> the patch - but then you will have it tomorrow.
> 


Sure! Once again, thanks a lot for your time and efforts :-)

Regards,
Srivatsa S. Bhat

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