Is topology_core_siblings for use by drivers?

[Matthew Wilcox]

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.

If device drivers are supposed to call this, please apply this patch:

----

Export cpu_core_map so modules can call topology_core_siblings()

Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 03f1a99..6cb0927 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -138,6 +138,7 @@ cpumask_t cpu_possible_map = CPU_MASK_NONE;
 EXPORT_SYMBOL(cpu_possible_map);
 
 cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
+EXPORT_SYMBOL(cpu_core_map);
 DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
 

-- 
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