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authorMike Travis <travis@sgi.com>2007-10-16 01:24:05 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:50 -0700
commitd5a7430ddcdb598261d70f7eb1bf450b5be52085 (patch)
tree3b94672e0dbc2bff125de3266908f1a47a17b795 /arch/ia64/kernel/smpboot.c
parent083576112940fda783d716fd5ccc744f81667b2f (diff)
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Convert cpu_sibling_map to be a per cpu variable
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>
Diffstat (limited to 'arch/ia64/kernel/smpboot.c')
-rw-r--r--arch/ia64/kernel/smpboot.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 308772f7cdd..c57dbce25c1 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -138,7 +138,9 @@ cpumask_t cpu_possible_map = CPU_MASK_NONE;
EXPORT_SYMBOL(cpu_possible_map);
cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
-cpumask_t cpu_sibling_map[NR_CPUS] __cacheline_aligned;
+DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
+EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
+
int smp_num_siblings = 1;
int smp_num_cpucores = 1;
@@ -650,12 +652,12 @@ clear_cpu_sibling_map(int cpu)
{
int i;
- for_each_cpu_mask(i, cpu_sibling_map[cpu])
- cpu_clear(cpu, cpu_sibling_map[i]);
+ for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu))
+ cpu_clear(cpu, per_cpu(cpu_sibling_map, i));
for_each_cpu_mask(i, cpu_core_map[cpu])
cpu_clear(cpu, cpu_core_map[i]);
- cpu_sibling_map[cpu] = cpu_core_map[cpu] = CPU_MASK_NONE;
+ per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE;
}
static void
@@ -666,7 +668,7 @@ remove_siblinginfo(int cpu)
if (cpu_data(cpu)->threads_per_core == 1 &&
cpu_data(cpu)->cores_per_socket == 1) {
cpu_clear(cpu, cpu_core_map[cpu]);
- cpu_clear(cpu, cpu_sibling_map[cpu]);
+ cpu_clear(cpu, per_cpu(cpu_sibling_map, cpu));
return;
}
@@ -807,8 +809,8 @@ set_cpu_sibling_map(int cpu)
cpu_set(i, cpu_core_map[cpu]);
cpu_set(cpu, cpu_core_map[i]);
if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) {
- cpu_set(i, cpu_sibling_map[cpu]);
- cpu_set(cpu, cpu_sibling_map[i]);
+ cpu_set(i, per_cpu(cpu_sibling_map, cpu));
+ cpu_set(cpu, per_cpu(cpu_sibling_map, i));
}
}
}
@@ -839,7 +841,7 @@ __cpu_up (unsigned int cpu)
if (cpu_data(cpu)->threads_per_core == 1 &&
cpu_data(cpu)->cores_per_socket == 1) {
- cpu_set(cpu, cpu_sibling_map[cpu]);
+ cpu_set(cpu, per_cpu(cpu_sibling_map, cpu));
cpu_set(cpu, cpu_core_map[cpu]);
return 0;
}