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

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Date:	Sat, 1 Sep 2007 09:10:40 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
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)

> 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.
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