Re: [PATCH 3/6] x86: Convert cpu_sibling_map to be a per cpu variable (v2)

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Andrew Morton wrote:
On Sat, 01 Sep 2007 17:04:06 +0530 Kamalesh Babulal <[email protected]> wrote:
Andrew Morton wrote:
On Fri, 24 Aug 2007 15:26:57 -0700 [email protected] 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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