linux-kernel - Re: [PATCH 05/17] x86-64: Move cpu number from PDA to per-cpu and consolidate with 32-bit.

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Message-ID: <73c1f2160901172157j6cd731e5s187e98a069a3ab96@mail.gmail.com>
Date:	Sun, 18 Jan 2009 00:57:41 -0500
From:	Brian Gerst <brgerst@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/17] x86-64: Move cpu number from PDA to per-cpu and 
	consolidate with 32-bit.

On Sun, Jan 18, 2009 at 12:05 AM, Tejun Heo <tj@...nel.org> wrote:
> Hello,
>
>> --- a/arch/x86/kernel/setup_percpu.c
>> +++ b/arch/x86/kernel/setup_percpu.c
>> @@ -147,6 +147,9 @@ unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
>>  #endif
>>  EXPORT_SYMBOL(__per_cpu_offset);
>>
>> +DEFINE_PER_CPU(int, cpu_number);
>> +EXPORT_PER_CPU_SYMBOL(cpu_number);
>
> This is inside CONFIG_HAVE_SETUP_PER_CPU_AREA.  I think voyage would
> be unhappy with this change.

Is there any specific reason Voyager doesn't use the x86
setup_per_cpu_areas() function?  I don't see anything on a quick
glance that would not work.  The x86 code is pretty much a superset of
the default code in init/main.c.

--
Brian Gerst
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