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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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    > > Please read the FAQ at http://www.tux.org/lkml/
    > >
    > >
    > >
    > 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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