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SubjectRe: [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@linux.vnet.ibm.com> wrote:
> Andrew Morton wrote:
> > On Fri, 24 Aug 2007 15:26:57 -0700 travis@sgi.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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