linux-kernel - Re: [PATCH] mach-shmobile: Emma Mobile EV2 SMP prototype code

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Date:	Wed, 09 May 2012 14:15:18 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Magnus Damm <magnus.damm@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"horms@...ge.net.au" <horms@...ge.net.au>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rjw@...k.pl" <rjw@...k.pl>,
	"lethal@...ux-sh.org" <lethal@...ux-sh.org>,
	"olof@...om.net" <olof@...om.net>
Subject: Re: [PATCH] mach-shmobile: Emma Mobile EV2 SMP prototype code

On 09/05/12 13:12, Arnd Bergmann wrote:
> On Wednesday 09 May 2012, Magnus Damm wrote:
>>  static unsigned int __init shmobile_smp_get_core_count(void)
>>  {
>> @@ -31,6 +32,9 @@ static unsigned int __init shmobile_smp_
>>  	if (is_r8a7779())
>>  		return r8a7779_get_core_count();
>>  
>> +	if (is_emev2())
>> +		return emev2_get_core_count();
>> +
>>  	return 1;
>>  }
>>  
>> @@ -41,6 +45,9 @@ static void __init shmobile_smp_prepare_
>>  
>>  	if (is_r8a7779())
>>  		r8a7779_smp_prepare_cpus();
>> +
>> +	if (is_emev2())
>> +		emev2_smp_prepare_cpus();
>>  }
>>  
>>  int shmobile_platform_cpu_kill(unsigned int cpu)
>> ...
> 
> This shows that we really want an abstraction for soc-specific SMP ops
> even within one platform, and we'll need the same thing for multiplatform.
> 
> Marc Zyngier already proposed a solution for this last year, but I
> think we couldn't agree on the details back then before he lost interest.
> I think we should pick that up again and get it into 3.6 so the code above
> can be simplified and we can do the multiplatform solution. We'll probably
> discuss the details in Hong Kong in a couple of weeks, so there is no
> point in changing it now, but I'd hope that you can migrate this to
> whatever we come up with in the following merge window.

I'm happy to revive the series if there is an interest.

	M.
-- 
Jazz is not dead. It just smells funny...

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