Much like on x86, now that powerpc is using USE_PERCPU_NUMA_NODE_ID, we
have an ordering issue during boot with early calls to cpu_to_node().
The value returned by those calls now depend on the per-cpu area being
setup, but that is not guaranteed to be the case during boot. Instead,
we need to add an early_cpu_to_node() which doesn't use the per-CPU area
and call that from certain spots that are known to invoke cpu_to_node()
before the per-CPU areas are not configured.
On an example 2-node NUMA system with the following topology:
available: 2 nodes (0-1)
node 0 cpus: 0 1 2 3
node 0 size: 2029 MB
node 0 free: 1753 MB
node 1 cpus: 4 5 6 7
node 1 size: 2045 MB
node 1 free: 1945 MB
node distances:
node 0 1
0: 10 40
1: 40 10
we currently emit at boot:
[ 0.000000] pcpu-alloc: [0] 0 1 2 3 [0] 4 5 6 7
After this commit, we correctly emit:
[ 0.000000] pcpu-alloc: [0] 0 1 2 3 [1] 4 5 6 7
Signed-off-by: Nishanth Aravamudan <n...@linux.vnet.ibm.com>
diff --git a/arch/powerpc/include/asm/topology.h
b/arch/powerpc/include/asm/topology.h
index 5f1048e..f2c4c89 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -39,6 +39,8 @@ static inline int pcibus_to_node(struct pci_bus *bus)
extern int __node_distance(int, int);
#define node_distance(a, b) __node_distance(a, b)
+extern int early_cpu_to_node(int);
+
extern void __init dump_numa_cpu_topology(void);
extern int sysfs_add_device_to_node(struct device *dev, int nid);
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index c69671c..23a2cf3 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -715,8 +715,8 @@ void __init setup_arch(char **cmdline_p)
static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
{
- return __alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu)), size, align,
- __pa(MAX_DMA_ADDRESS));
+ return __alloc_bootmem_node(NODE_DATA(early_cpu_to_node(cpu)), size,
+ align, __pa(MAX_DMA_ADDRESS));
}
static void __init pcpu_fc_free(void *ptr, size_t size)
@@ -726,7 +726,7 @@ static void __init pcpu_fc_free(void *ptr, size_t size)
static int pcpu_cpu_distance(unsigned int from, unsigned int to)
{
- if (cpu_to_node(from) == cpu_to_node(to))
+ if (early_cpu_to_node(from) == early_cpu_to_node(to))
return LOCAL_DISTANCE;
else
return REMOTE_DISTANCE;
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 5e80621..9ffabf4 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -157,6 +157,11 @@ static void map_cpu_to_node(int cpu, int node)
cpumask_set_cpu(cpu, node_to_cpumask_map[node]);
}
+int early_cpu_to_node(int cpu)
+{
+ return numa_cpu_lookup_table[cpu];
+}
+
#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PPC_SPLPAR)
static void unmap_cpu_from_node(unsigned long cpu)
{
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
