From 8c272261194dfda11cc046fbe808e052f6f284eb Mon Sep 17 00:00:00 2001
From: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Date: Mon, 19 May 2014 11:14:23 -0700
Subject: [PATCH] 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>
---
arch/powerpc/Kconfig | 4 ++++
arch/powerpc/include/asm/topology.h | 13 -------------
arch/powerpc/kernel/smp.c | 6 ++++++
3 files changed, 10 insertions(+), 13 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e0998997943bf..9125964af409b 100644
--- 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 c9202151079f2..5ecf7ea52ad84 100644
--- 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 e2a4232c5871a..d7252adea7595 100644
--- 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);
--
2.30.2