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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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17
arch/sparc64/kernel/smp.c
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@@ -52,14 +52,13 @@ int sparc64_multi_core __read_mostly;
cpumask_t cpu_possible_map __read_mostly = CPU_MASK_NONE;
cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE;
cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly =
{ [0 ... NR_CPUS-1] = CPU_MASK_NONE };
DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE;
cpumask_t cpu_core_map[NR_CPUS] __read_mostly =
{ [0 ... NR_CPUS-1] = CPU_MASK_NONE };
EXPORT_SYMBOL(cpu_possible_map);
EXPORT_SYMBOL(cpu_online_map);
EXPORT_SYMBOL(cpu_sibling_map);
EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
EXPORT_SYMBOL(cpu_core_map);
static cpumask_t smp_commenced_mask;
@@ -1261,16 +1260,16 @@ void __devinit smp_fill_in_sib_core_maps(void)
for_each_present_cpu(i) {
unsigned int j;
cpus_clear(cpu_sibling_map[i]);
cpus_clear(per_cpu(cpu_sibling_map, i));
if (cpu_data(i).proc_id == -1) {
cpu_set(i, cpu_sibling_map[i]);
cpu_set(i, per_cpu(cpu_sibling_map, i));
continue;
}
for_each_present_cpu(j) {
if (cpu_data(i).proc_id ==
cpu_data(j).proc_id)
cpu_set(j, cpu_sibling_map[i]);
cpu_set(j, per_cpu(cpu_sibling_map, i));
}
}
}
@@ -1342,9 +1341,9 @@ int __cpu_disable(void)
cpu_clear(cpu, cpu_core_map[i]);
cpus_clear(cpu_core_map[cpu]);
for_each_cpu_mask(i, cpu_sibling_map[cpu])
cpu_clear(cpu, cpu_sibling_map[i]);
cpus_clear(cpu_sibling_map[cpu]);
for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu))
cpu_clear(cpu, per_cpu(cpu_sibling_map, i));
cpus_clear(per_cpu(cpu_sibling_map, cpu));
c = &cpu_data(cpu);