powerpc/numa: Enable USE_PERCPU_NUMA_NODE_ID

Based off 3bccd996 for ia64, convert powerpc to use the generic per-CPU
topology tracking, specifically:

    initialize per cpu numa_node entry in start_secondary
    remove the powerpc cpu_to_node()
    define CONFIG_USE_PERCPU_NUMA_NODE_ID if NUMA

Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e099899..9125964 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -453,6 +453,10 @@ config NODES_SHIFT
        default "4"
        depends on NEED_MULTIPLE_NODES
 
+config USE_PERCPU_NUMA_NODE_ID
+       def_bool y
+       depends on NUMA
+
 config ARCH_SELECT_MEMORY_MODEL
        def_bool y
        depends on PPC64

diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index c920215..5ecf7ea 100644 (file)
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -20,19 +20,6 @@ struct device_node;
 
 #include <asm/mmzone.h>
 
-static inline int cpu_to_node(int cpu)
-{
-       int nid;
-
-       nid = numa_cpu_lookup_table[cpu];
-
-       /*
-        * During early boot, the numa-cpu lookup table might not have been
-        * setup for all CPUs yet. In such cases, default to node 0.
-        */
-       return (nid < 0) ? 0 : nid;
-}
-
 #define parent_node(node)      (node)
 
 #define cpumask_of_node(node) ((node) == -1 ?                          \

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index e2a4232..d7252ad 100644 (file)
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -390,6 +390,7 @@ void smp_prepare_boot_cpu(void)
 #ifdef CONFIG_PPC64
        paca[boot_cpuid].__current = current;
 #endif
+       set_numa_node(numa_cpu_lookup_table[boot_cpuid]);
        current_set[boot_cpuid] = task_thread_info(current);
 }
 
@@ -750,6 +751,11 @@ void start_secondary(void *unused)
        }
        traverse_core_siblings(cpu, true);
 
+       /*
+        * numa_node_id() works after this.
+        */
+       set_numa_node(numa_cpu_lookup_table[cpu]);
+
        smp_wmb();
        notify_cpu_starting(cpu);
        set_cpu_online(cpu, true);