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Convert cpu_sibling_map to be a per cpu variable

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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.

Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Travis 2007-10-16 01:24:05 -07:00 • committed by Linus Torvalds
parent 0835761129
commit d5a7430ddc
26 changed files with 107 additions and 82 deletions
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20
arch/powerpc/kernel/setup-common.c
View file

@ -413,16 +413,28 @@ void __init smp_setup_cpu_maps(void)
of_node_put(dn);
}
vdso_data->processorCount = num_present_cpus();
#endif /* CONFIG_PPC64 */
}
/*
* Being that cpu_sibling_map is now a per_cpu array, then it cannot
* be initialized until the per_cpu areas have been created. This
* function is now called from setup_per_cpu_areas().
*/
void __init smp_setup_cpu_sibling_map(void)
{
#if defined(CONFIG_PPC64)
int cpu;
/*
* Do the sibling map; assume only two threads per processor.
*/
for_each_possible_cpu(cpu) {
cpu_set(cpu, cpu_sibling_map[cpu]);
cpu_set(cpu, per_cpu(cpu_sibling_map, cpu));
if (cpu_has_feature(CPU_FTR_SMT))
cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
cpu_set(cpu ^ 0x1, per_cpu(cpu_sibling_map, cpu));
}
vdso_data->processorCount = num_present_cpus();
#endif /* CONFIG_PPC64 */
}
#endif /* CONFIG_SMP */