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Subject[PATCH 9/9] x86: Unify NUMA initialization between 32 and 64bit
Date
Now that everything else is unified, NUMA initialization can be
unified too.

* numa_init_array() and init_cpu_to_node() are moved from numa_64 to
numa.

* numa_32::initmem_init() is updated to call numa_init_array() and
setup_arch() to call init_cpu_to_node() on 32bit too.

* x86_cpu_to_node_map is now initialized to NUMA_NO_NODE on 32bit too.
This is safe now as numa_init_array() will initialize it early
during boot.

This makes NUMA mapping fully initialized before setup_per_cpu_areas()
on 32bit too and thus makes the first percpu chunk which contains all
the static variables and some of dynamic area allocated with NUMA
affinity correctly considered.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
---
arch/x86/include/asm/numa.h | 4 ++
arch/x86/include/asm/numa_64.h | 3 --
arch/x86/kernel/setup.c | 2 -
arch/x86/mm/numa.c | 76 +++++++++++++++++++++++++++++++++++++--
arch/x86/mm/numa_32.c | 1 +
arch/x86/mm/numa_64.c | 75 ---------------------------------------
6 files changed, 77 insertions(+), 84 deletions(-)
diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index 77f8bcb..b131348 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -37,6 +37,8 @@ static inline void set_apicid_to_node(int apicid, s16 node)
#ifdef CONFIG_NUMA
extern void __cpuinit numa_set_node(int cpu, int node);
extern void __cpuinit numa_clear_node(int cpu);
+extern void __init numa_init_array(void);
+extern void __init init_cpu_to_node(void);

# ifdef CONFIG_DEBUG_PER_CPU_MAPS
extern void __cpuinit numa_add_cpu(int cpu);
@@ -55,6 +57,8 @@ static inline void __cpuinit numa_remove_cpu(int cpu)
#else /* CONFIG_NUMA */
static inline void numa_set_node(int cpu, int node) { }
static inline void numa_clear_node(int cpu) { }
+static inline void numa_init_array(void) { }
+static inline void init_cpu_to_node(void) { }
static inline void numa_add_cpu(int cpu) { }
static inline void numa_remove_cpu(int cpu) { }
#endif /* CONFIG_NUMA */
diff --git a/arch/x86/include/asm/numa_64.h b/arch/x86/include/asm/numa_64.h
index 6331190..db3baa2 100644
--- a/arch/x86/include/asm/numa_64.h
+++ b/arch/x86/include/asm/numa_64.h
@@ -13,7 +13,6 @@ extern int compute_hash_shift(struct bootnode *nodes, int numblks,

#define ZONE_ALIGN (1UL << (MAX_ORDER+PAGE_SHIFT))

-extern void numa_init_array(void);
extern int numa_off;

extern unsigned long numa_free_all_bootmem(void);
@@ -28,7 +27,6 @@ extern void setup_node_bootmem(int nodeid, unsigned long start,
*/
#define NODE_MIN_SIZE (4*1024*1024)

-extern void __init init_cpu_to_node(void);
extern int __cpuinit numa_cpu_node(int cpu);

#ifdef CONFIG_NUMA_EMU
@@ -36,7 +34,6 @@ extern int __cpuinit numa_cpu_node(int cpu);
#define FAKE_NODE_MIN_HASH_MASK (~(FAKE_NODE_MIN_SIZE - 1UL))
#endif /* CONFIG_NUMA_EMU */
#else
-static inline void init_cpu_to_node(void) { }
static inline int numa_cpu_node(int cpu) { return NUMA_NO_NODE; }
#endif

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 21c6746..fca6d54 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1030,9 +1030,7 @@ void __init setup_arch(char **cmdline_p)

prefill_possible_map();

-#ifdef CONFIG_X86_64
init_cpu_to_node();
-#endif

init_apic_mappings();
ioapic_init_mappings();
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index c52c267..dd93a41 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -16,11 +16,7 @@ EXPORT_SYMBOL(node_to_cpumask_map);
/*
* Map cpu index to node index
*/
-#ifdef CONFIG_X86_32
-DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, 0);
-#else
DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
-#endif
EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);

void __cpuinit numa_set_node(int cpu, int node)
@@ -77,6 +73,78 @@ void __init setup_node_to_cpumask_map(void)
pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids);
}

+/*
+ * There are unfortunately some poorly designed mainboards around that
+ * only connect memory to a single CPU. This breaks the 1:1 cpu->node
+ * mapping. To avoid this fill in the mapping for all possible CPUs,
+ * as the number of CPUs is not known yet. We round robin the existing
+ * nodes.
+ */
+void __init numa_init_array(void)
+{
+ int rr, i;
+
+ rr = first_node(node_online_map);
+ for (i = 0; i < nr_cpu_ids; i++) {
+ if (early_cpu_to_node(i) != NUMA_NO_NODE)
+ continue;
+ numa_set_node(i, rr);
+ rr = next_node(rr, node_online_map);
+ if (rr == MAX_NUMNODES)
+ rr = first_node(node_online_map);
+ }
+}
+
+static __init int find_near_online_node(int node)
+{
+ int n, val;
+ int min_val = INT_MAX;
+ int best_node = -1;
+
+ for_each_online_node(n) {
+ val = node_distance(node, n);
+
+ if (val < min_val) {
+ min_val = val;
+ best_node = n;
+ }
+ }
+
+ return best_node;
+}
+
+/*
+ * Setup early cpu_to_node.
+ *
+ * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
+ * and apicid_to_node[] tables have valid entries for a CPU.
+ * This means we skip cpu_to_node[] initialisation for NUMA
+ * emulation and faking node case (when running a kernel compiled
+ * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
+ * is already initialized in a round robin manner at numa_init_array,
+ * prior to this call, and this initialization is good enough
+ * for the fake NUMA cases.
+ *
+ * Called before the per_cpu areas are setup.
+ */
+void __init init_cpu_to_node(void)
+{
+ int cpu;
+ u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
+
+ BUG_ON(cpu_to_apicid == NULL);
+
+ for_each_possible_cpu(cpu) {
+ int node = numa_cpu_node(cpu);
+
+ if (node == NUMA_NO_NODE)
+ continue;
+ if (!node_online(node))
+ node = find_near_online_node(node);
+ numa_set_node(cpu, node);
+ }
+}
+
#ifdef CONFIG_DEBUG_PER_CPU_MAPS

int __cpu_to_node(int cpu)
diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
index 9f27ae2..0bad0f8 100644
--- a/arch/x86/mm/numa_32.c
+++ b/arch/x86/mm/numa_32.c
@@ -367,6 +367,7 @@ void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn,
*/

get_memcfg_numa();
+ numa_init_array();

kva_pages = roundup(calculate_numa_remap_pages(), PTRS_PER_PTE);

diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index c8c2e29..e7b1ab5 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -225,28 +225,6 @@ setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
node_set_online(nodeid);
}

-/*
- * There are unfortunately some poorly designed mainboards around that
- * only connect memory to a single CPU. This breaks the 1:1 cpu->node
- * mapping. To avoid this fill in the mapping for all possible CPUs,
- * as the number of CPUs is not known yet. We round robin the existing
- * nodes.
- */
-void __init numa_init_array(void)
-{
- int rr, i;
-
- rr = first_node(node_online_map);
- for (i = 0; i < nr_cpu_ids; i++) {
- if (early_cpu_to_node(i) != NUMA_NO_NODE)
- continue;
- numa_set_node(i, rr);
- rr = next_node(rr, node_online_map);
- if (rr == MAX_NUMNODES)
- rr = first_node(node_online_map);
- }
-}
-
#ifdef CONFIG_NUMA_EMU
/* Numa emulation */
static struct bootnode nodes[MAX_NUMNODES] __initdata;
@@ -669,59 +647,6 @@ static __init int numa_setup(char *opt)
}
early_param("numa", numa_setup);

-#ifdef CONFIG_NUMA
-
-static __init int find_near_online_node(int node)
-{
- int n, val;
- int min_val = INT_MAX;
- int best_node = -1;
-
- for_each_online_node(n) {
- val = node_distance(node, n);
-
- if (val < min_val) {
- min_val = val;
- best_node = n;
- }
- }
-
- return best_node;
-}
-
-/*
- * Setup early cpu_to_node.
- *
- * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
- * and apicid_to_node[] tables have valid entries for a CPU.
- * This means we skip cpu_to_node[] initialisation for NUMA
- * emulation and faking node case (when running a kernel compiled
- * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
- * is already initialized in a round robin manner at numa_init_array,
- * prior to this call, and this initialization is good enough
- * for the fake NUMA cases.
- *
- * Called before the per_cpu areas are setup.
- */
-void __init init_cpu_to_node(void)
-{
- int cpu;
- u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
-
- BUG_ON(cpu_to_apicid == NULL);
-
- for_each_possible_cpu(cpu) {
- int node = numa_cpu_node(cpu);
-
- if (node == NUMA_NO_NODE)
- continue;
- if (!node_online(node))
- node = find_near_online_node(node);
- numa_set_node(cpu, node);
- }
-}
-#endif
-
int __cpuinit numa_cpu_node(int cpu)
{
int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
--
1.7.1


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