linux-kernel - Re: Is topology_core_siblings for use by drivers?

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Message-ID: <20080729092847.GA5324@osiris.boeblingen.de.ibm.com>
Date:	Tue, 29 Jul 2008 11:28:47 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Is topology_core_siblings for use by drivers?

On Tue, Jul 29, 2008 at 01:14:22AM -0600, Matthew Wilcox wrote:
> 
> allmodconfig currently dies with:
> 
> ERROR: "cpu_core_map" [drivers/net/sfc/sfc.ko] undefined!
> 
> $ grep -r cpu_core_map include/asm-ia64/
> include/asm-ia64/smp.h:extern cpumask_t cpu_core_map[NR_CPUS];
> include/asm-ia64/topology.h:#define topology_core_siblings(cpu) (cpu_core_map[cpu])
> 
> OK ... it's not exported to modules.  Do other architectures have this
> problem?
> 
> $ grep topology_core_siblings include/asm-*/topology.h
> include/asm-ia64/topology.h:#define topology_core_siblings(cpu) (cpu_core_map[cpu])
> include/asm-powerpc/topology.h:#define topology_core_siblings(cpu) (per_cpu(cpu_core_map, cpu))
> include/asm-s390/topology.h:#define topology_core_siblings(cpu) (cpu_core_map[cpu])
> include/asm-x86/topology.h:#define topology_core_siblings(cpu) (per_cpu(cpu_core_map, cpu))
> 
> s390, I guess.  But they don't have PCI device drivers.

Yes, luckily it doesn't get compiled on s390. Btw. the for_each_online_cpu
loop where this gets used doesn't seem to be save wrt cpu hotplug.
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