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Subject[PATCH 25/26] x86-64, NUMA: Kill mem_nodes_parsed
Date
With all memory configuration information now carried in numa_meminfo,
there's no need to keep mem_nodes_parsed separate. Drop it and use
numa_nodes_parsed for CPU / memory-less nodes.

A new helper numa_nodemask_from_meminfo() is added to calculate
memnode mask on the fly which is currently used to set
node_possible_map.

This simplifies NUMA init methods a bit and removes a source of
possible inconsistencies.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Shaohui Zheng <shaohui.zheng@intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/include/asm/numa_64.h | 1 -
arch/x86/mm/amdtopology_64.c | 5 ++---
arch/x86/mm/numa_64.c | 20 ++++++++++++++++----
arch/x86/mm/srat_64.c | 7 ++-----
4 files changed, 20 insertions(+), 13 deletions(-)
diff --git a/arch/x86/include/asm/numa_64.h b/arch/x86/include/asm/numa_64.h
index da57c70..04e74d8 100644
--- a/arch/x86/include/asm/numa_64.h
+++ b/arch/x86/include/asm/numa_64.h
@@ -26,7 +26,6 @@ extern void setup_node_bootmem(int nodeid, unsigned long start,
#define NR_NODE_MEMBLKS (MAX_NUMNODES*2)

extern nodemask_t numa_nodes_parsed __initdata;
-extern nodemask_t mem_nodes_parsed __initdata;

extern int __cpuinit numa_cpu_node(int cpu);
extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
diff --git a/arch/x86/mm/amdtopology_64.c b/arch/x86/mm/amdtopology_64.c
index e76bffa..fd7b609 100644
--- a/arch/x86/mm/amdtopology_64.c
+++ b/arch/x86/mm/amdtopology_64.c
@@ -122,7 +122,7 @@ int __init amd_numa_init(void)
nodeid, (base >> 8) & 3, (limit >> 8) & 3);
return -EINVAL;
}
- if (node_isset(nodeid, mem_nodes_parsed)) {
+ if (node_isset(nodeid, numa_nodes_parsed)) {
pr_info("Node %d already present, skipping\n",
nodeid);
continue;
@@ -167,11 +167,10 @@ int __init amd_numa_init(void)

prevbase = base;
numa_add_memblk(nodeid, base, limit);
- node_set(nodeid, mem_nodes_parsed);
node_set(nodeid, numa_nodes_parsed);
}

- if (!nodes_weight(mem_nodes_parsed))
+ if (!nodes_weight(numa_nodes_parsed))
return -ENOENT;

/*
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 1797392..9dd4a34 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -37,7 +37,6 @@ struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL(node_data);

nodemask_t numa_nodes_parsed __initdata;
-nodemask_t mem_nodes_parsed __initdata;

struct memnode memnode;

@@ -344,6 +343,20 @@ static int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
}

/*
+ * Set nodes, which have memory in @mi, in *@nodemask.
+ */
+static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
+ const struct numa_meminfo *mi)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
+ if (mi->blk[i].start != mi->blk[i].end &&
+ mi->blk[i].nid != NUMA_NO_NODE)
+ node_set(mi->blk[i].nid, *nodemask);
+}
+
+/*
* Sanity check to catch more bad NUMA configurations (they are amazingly
* common). Make sure the nodes cover all memory.
*/
@@ -379,7 +392,8 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
int i, j, nid;

/* Account for nodes with cpus and no memory */
- nodes_or(node_possible_map, mem_nodes_parsed, numa_nodes_parsed);
+ node_possible_map = numa_nodes_parsed;
+ numa_nodemask_from_meminfo(&node_possible_map, mi);
if (WARN_ON(nodes_empty(node_possible_map)))
return -EINVAL;

@@ -821,7 +835,6 @@ static int dummy_numa_init(void)
0LU, max_pfn << PAGE_SHIFT);

node_set(0, numa_nodes_parsed);
- node_set(0, mem_nodes_parsed);
numa_add_memblk(0, 0, (u64)max_pfn << PAGE_SHIFT);

return 0;
@@ -849,7 +862,6 @@ void __init initmem_init(void)
set_apicid_to_node(j, NUMA_NO_NODE);

nodes_clear(numa_nodes_parsed);
- nodes_clear(mem_nodes_parsed);
nodes_clear(node_possible_map);
nodes_clear(node_online_map);
memset(&numa_meminfo, 0, sizeof(numa_meminfo));
diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index 8185189..4f8e6cd 100644
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -238,9 +238,7 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
printk(KERN_INFO "SRAT: Node %u PXM %u %lx-%lx\n", node, pxm,
start, end);

- if (!(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE))
- node_set(node, mem_nodes_parsed);
- else
+ if (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)
update_nodes_add(node, start, end);
}

@@ -310,10 +308,9 @@ void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
__acpi_map_pxm_to_node(fake_node_to_pxm_map[i], i);
memcpy(__apicid_to_node, fake_apicid_to_node, sizeof(__apicid_to_node));

- nodes_clear(mem_nodes_parsed);
for (i = 0; i < num_nodes; i++)
if (fake_nodes[i].start != fake_nodes[i].end)
- node_set(i, mem_nodes_parsed);
+ node_set(i, numa_nodes_parsed);
}

static int null_slit_node_compare(int a, int b)
--
1.7.1


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