linux-kernel - Re: [PATCH 3/6] x86: Convert cpu_sibling

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Date:	Sun, 02 Sep 2007 17:18:32 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	travis@....com, ak@...e.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, clameter@....com
Subject: Re: [PATCH 3/6] x86: Convert cpu_sibling_map to be a per cpu variable
 (v2)

Andrew Morton wrote:
>> On Sat, 01 Sep 2007 17:04:06 +0530 Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> wrote:
>> Andrew Morton wrote:
>>     
>>> On Fri, 24 Aug 2007 15:26:57 -0700 travis@....com wrote:
>>>
>>>   
>>>       
>>>> Convert cpu_sibling_map from a static array sized by NR_CPUS to a
>>>> per_cpu variable.  This saves sizeof(cpumask_t) * NR unused cpus.
>>>> Access is mostly from startup and CPU HOTPLUG functions.
>>>>     
>>>>         
>>> ia64 allmodconfig:
>>>
>>> kernel/sched.c: In function `cpu_to_phys_group':                                                                             kernel/sched.c:5937: error: `per_cpu__cpu_sibling_map' undeclared (first use in this function)                               kernel/sched.c:5937: error: (Each undeclared identifier is reported only once
>>> kernel/sched.c:5937: error: for each function it appears in.)                                                                kernel/sched.c:5937: warning: type defaults to `int' in declaration of `type name'
>>> kernel/sched.c:5937: error: invalid type argument of `unary *'                                                               kernel/sched.c: In function `build_sched_domains':                                                                           kernel/sched.c:6172: error: `per_cpu__cpu_sibling_map' undeclared (first use in this function)                               kernel/sched.c:6172: warning: type defaults to `int' in declaration of `type name'                                           kernel/sched.c:6172: error: invalid type argument of `unary *'                                                               kernel/sched.c:6183: warning: type defaults to `int' in declaration of `type name'                                           kernel/sched.c:6183: error: invalid type argument of `unary *'                                                               
>>> -
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>>>   
>>>       
>> Hi Andrew,
>>
>> I get the exact build failure on ppc64 machine with 2.6.23-rc4-mm1.
>>
>>     
>
> The ia64 workaround was to disable SCHED_SMT.
>   
Hi Andrew,

Same workaround works with ppc64 also.

Thanks & Regards,
Kamalesh Babulal.
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