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Date: Sun, 27 Sep 2015 23:59:09 +0530
From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To: <benh@...nel.crashing.org>, <paulus@...ba.org>,
<mpe@...erman.id.au>
Cc: <anton@...ba.org>, <linuxppc-dev@...ts.ozlabs.org>,
<linux-kernel@...r.kernel.org>, <cl@...ux.com>,
<nacc@...ux.vnet.ibm.com>, <gkurz@...ux.vnet.ibm.com>,
<grant.likely@...aro.org>, <nikunj@...ux.vnet.ibm.com>,
<raghavendra.kt@...ux.vnet.ibm.com>, <khandual@...ux.vnet.ibm.com>,
Raghavendra K T <raghavendra.kt@...ux.inet.ibm.com>
Subject: [PATCH RFC 1/5] powerpc:numa Add numa_cpu_lookup function to update lookup table
We access numa_cpu_lookup_table array directly in all the places
to read/update numa cpu lookup information. Instead use a helper
function to update.
This is helpful in changing the way numa<-->cpu mapping in single
place when needed.
This is a cosmetic change, no change in functionality.
Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.inet.ibm.com>
---
arch/powerpc/include/asm/mmzone.h | 2 +-
arch/powerpc/kernel/smp.c | 10 +++++-----
arch/powerpc/mm/numa.c | 28 +++++++++++++++++-----------
3 files changed, 23 insertions(+), 17 deletions(-)
diff --git a/arch/powerpc/include/asm/mmzone.h b/arch/powerpc/include/asm/mmzone.h
index 7b58917..c24a5f4 100644
--- a/arch/powerpc/include/asm/mmzone.h
+++ b/arch/powerpc/include/asm/mmzone.h
@@ -29,7 +29,7 @@ extern struct pglist_data *node_data[];
* Following are specific to this numa platform.
*/
-extern int numa_cpu_lookup_table[];
+extern int numa_cpu_lookup(int cpu);
extern cpumask_var_t node_to_cpumask_map[];
#ifdef CONFIG_MEMORY_HOTPLUG
extern unsigned long max_pfn;
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index ec9ec20..56fbe9e 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -381,9 +381,9 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
* numa_node_id() works after this.
*/
if (cpu_present(cpu)) {
- set_cpu_numa_node(cpu, numa_cpu_lookup_table[cpu]);
+ set_cpu_numa_node(cpu, numa_cpu_lookup(cpu));
set_cpu_numa_mem(cpu,
- local_memory_node(numa_cpu_lookup_table[cpu]));
+ local_memory_node(numa_cpu_lookup(cpu)));
}
}
@@ -400,7 +400,7 @@ void smp_prepare_boot_cpu(void)
#ifdef CONFIG_PPC64
paca[boot_cpuid].__current = current;
#endif
- set_numa_node(numa_cpu_lookup_table[boot_cpuid]);
+ set_numa_node(numa_cpu_lookup(boot_cpuid));
current_set[boot_cpuid] = task_thread_info(current);
}
@@ -718,8 +718,8 @@ void start_secondary(void *unused)
}
traverse_core_siblings(cpu, true);
- set_numa_node(numa_cpu_lookup_table[cpu]);
- set_numa_mem(local_memory_node(numa_cpu_lookup_table[cpu]));
+ set_numa_node(numa_cpu_lookup(cpu));
+ set_numa_mem(local_memory_node(numa_cpu_lookup(cpu)));
smp_wmb();
notify_cpu_starting(cpu);
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 8b9502a..d5e6eee 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -52,7 +52,6 @@ int numa_cpu_lookup_table[NR_CPUS];
cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
struct pglist_data *node_data[MAX_NUMNODES];
-EXPORT_SYMBOL(numa_cpu_lookup_table);
EXPORT_SYMBOL(node_to_cpumask_map);
EXPORT_SYMBOL(node_data);
@@ -134,19 +133,25 @@ static int __init fake_numa_create_new_node(unsigned long end_pfn,
return 0;
}
-static void reset_numa_cpu_lookup_table(void)
+int numa_cpu_lookup(int cpu)
{
- unsigned int cpu;
-
- for_each_possible_cpu(cpu)
- numa_cpu_lookup_table[cpu] = -1;
+ return numa_cpu_lookup_table[cpu];
}
+EXPORT_SYMBOL(numa_cpu_lookup);
-static void update_numa_cpu_lookup_table(unsigned int cpu, int node)
+static inline void update_numa_cpu_lookup_table(unsigned int cpu, int node)
{
numa_cpu_lookup_table[cpu] = node;
}
+static void reset_numa_cpu_lookup_table(void)
+{
+ unsigned int cpu;
+
+ for_each_possible_cpu(cpu)
+ update_numa_cpu_lookup_table(cpu, -1);
+}
+
static void map_cpu_to_node(int cpu, int node)
{
update_numa_cpu_lookup_table(cpu, node);
@@ -160,7 +165,7 @@ static void map_cpu_to_node(int cpu, int node)
#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PPC_SPLPAR)
static void unmap_cpu_from_node(unsigned long cpu)
{
- int node = numa_cpu_lookup_table[cpu];
+ int node = numa_cpu_lookup(cpu);
dbg("removing cpu %lu from node %d\n", cpu, node);
@@ -536,7 +541,8 @@ static int numa_setup_cpu(unsigned long lcpu)
* directly instead of querying the firmware, since it represents
* the most recent mapping notified to us by the platform (eg: VPHN).
*/
- if ((nid = numa_cpu_lookup_table[lcpu]) >= 0) {
+ nid = numa_cpu_lookup(lcpu);
+ if (nid >= 0) {
map_cpu_to_node(lcpu, nid);
return nid;
}
@@ -1413,7 +1419,7 @@ int arch_update_cpu_topology(void)
if (new_nid < 0 || !node_online(new_nid))
new_nid = first_online_node;
- if (new_nid == numa_cpu_lookup_table[cpu]) {
+ if (new_nid == numa_cpu_lookup(cpu)) {
cpumask_andnot(&cpu_associativity_changes_mask,
&cpu_associativity_changes_mask,
cpu_sibling_mask(cpu));
@@ -1425,7 +1431,7 @@ int arch_update_cpu_topology(void)
ud = &updates[i++];
ud->cpu = sibling;
ud->new_nid = new_nid;
- ud->old_nid = numa_cpu_lookup_table[sibling];
+ ud->old_nid = numa_cpu_lookup(sibling);
cpumask_set_cpu(sibling, &updated_cpus);
if (i < weight)
ud->next = &updates[i];
--
1.7.11.7
--
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