[RFC 2/4] ARM: topology: factorize the update of sibling masks

Vincent Guittot
2012-06-12T12:02:49Z

The factorization has also be proposed in another patch that is not merge yet.
http://lists.infradead.org/pipermail/linux-arm-kernel/2012-January/080873.html
So it could be dropped depending of the state of the other patch.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
---
arch/arm/kernel/topology.c | 47 ++++++++++++++++++++++++--------------------
1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 00301a7..2f85a64 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -80,6 +80,31 @@ 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) {
+ 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();
+}
+
/*
* 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,
@@ -89,7 +114,6 @@ 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)
@@ -131,26 +155,7 @@ 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,
--
1.7.9.5