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ARM: 7462/1: topology: factorize the update of sibling masks

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This factorization has also been proposed in another patch that has not been
merged yet:
http://lists.infradead.org/pipermail/linux-arm-kernel/2012-January/080873.html
So, this patch could be dropped depending of the state of the other one.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Vincent Guittot 2012-07-10 14:11:11 +01:00 committed by Russell King
parent 130d9aabf9
commit cb75dacb39
1 changed files with 27 additions and 21 deletions
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48
arch/arm/kernel/topology.c
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@ -82,6 +82,32 @@ const struct cpumask *cpu_coregroup_mask(int cpu)
return &cpu_topology[cpu].core_sibling;
}
void update_siblings_masks(unsigned int cpuid)
{
struct cputopo_arm *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
int cpu;
/* update core and thread sibling masks */
for_each_possible_cpu(cpu) {
cpu_topo = &cpu_topology[cpu];
if (cpuid_topo->socket_id != cpu_topo->socket_id)
continue;
cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
if (cpu != cpuid)
cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
if (cpuid_topo->core_id != cpu_topo->core_id)
continue;
cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
if (cpu != cpuid)
cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
}
smp_wmb();
}
/*
* store_cpu_topology is called at boot when only one cpu is running
* and with the mutex cpu_hotplug.lock locked, when several cpus have booted,
@ -91,7 +117,6 @@ void store_cpu_topology(unsigned int cpuid)
{
struct cputopo_arm *cpuid_topo = &cpu_topology[cpuid];
unsigned int mpidr;
unsigned int cpu;
/* If the cpu topology has been already set, just return */
if (cpuid_topo->core_id != -1)
@ -133,26 +158,7 @@ void store_cpu_topology(unsigned int cpuid)
cpuid_topo->socket_id = -1;
}
/* update core and thread sibling masks */
for_each_possible_cpu(cpu) {
struct cputopo_arm *cpu_topo = &cpu_topology[cpu];
if (cpuid_topo->socket_id == cpu_topo->socket_id) {
cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
if (cpu != cpuid)
cpumask_set_cpu(cpu,
&cpuid_topo->core_sibling);
if (cpuid_topo->core_id == cpu_topo->core_id) {
cpumask_set_cpu(cpuid,
&cpu_topo->thread_sibling);
if (cpu != cpuid)
cpumask_set_cpu(cpu,
&cpuid_topo->thread_sibling);
}
}
}
smp_wmb();
update_siblings_masks(cpuid);
printk(KERN_INFO "CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
cpuid, cpu_topology[cpuid].thread_id,