The patch titled
pgdat allocation and update for ia64 of memory hotplug: update pgdat address array
has been removed from the -mm tree. Its filename is
pgdat-allocation-and-update-for-ia64-of-memory-hotplug-update-pgdat-address-array.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: pgdat allocation and update for ia64 of memory hotplug: update pgdat address array
From: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>
This is to refresh node_data[] array for ia64. As I mentioned previous
patches, ia64 has copies of information of pgdat address array on each node as
per node data.
At v2 of node_add, this function used stop_machine_run() to update them. (I
wished that they were copied safety as much as possible.) But, in this patch,
this arrays are just copied simply, and set node_online_map bit after
completion of pgdat initialization.
So, kernel must touch NODE_DATA() macro after checking node_online_map().
(Current code has already done it.) This is more simple way for just
hot-add.....
Note : It will be problem when hot-remove will occur,
because, even if online_map bit is set, kernel may
touch NODE_DATA() due to race condition. :-(
Signed-off-by: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/ia64/mm/discontig.c | 24 +++++++++++++++++++-----
include/asm-ia64/nodedata.h | 12 ++++++++++++
include/linux/memory_hotplug.h | 4 +---
3 files changed, 32 insertions(+), 8 deletions(-)
diff -puN arch/ia64/mm/discontig.c~pgdat-allocation-and-update-for-ia64-of-memory-hotplug-update-pgdat-address-array arch/ia64/mm/discontig.c
--- a/arch/ia64/mm/discontig.c~pgdat-allocation-and-update-for-ia64-of-memory-hotplug-update-pgdat-address-array
+++ a/arch/ia64/mm/discontig.c
@@ -308,6 +308,17 @@ static void __init reserve_pernode_space
}
}
+static void __meminit scatter_node_data(void)
+{
+ pg_data_t **dst;
+ int node;
+
+ for_each_online_node(node) {
+ dst = LOCAL_DATA_ADDR(pgdat_list[node])->pg_data_ptrs;
+ memcpy(dst, pgdat_list, sizeof(pgdat_list));
+ }
+}
+
/**
* initialize_pernode_data - fixup per-cpu & per-node pointers
*
@@ -320,11 +331,8 @@ static void __init initialize_pernode_da
{
int cpu, node;
- /* Copy the pg_data_t list to each node and init the node field */
- for_each_online_node(node) {
- memcpy(mem_data[node].node_data->pg_data_ptrs, pgdat_list,
- sizeof(pgdat_list));
- }
+ scatter_node_data();
+
#ifdef CONFIG_SMP
/* Set the node_data pointer for each per-cpu struct */
for (cpu = 0; cpu < NR_CPUS; cpu++) {
@@ -783,3 +791,9 @@ void __init paging_init(void)
zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
}
+
+void arch_refresh_nodedata(int update_node, pg_data_t *update_pgdat)
+{
+ pgdat_list[update_node] = update_pgdat;
+ scatter_node_data();
+}
diff -puN include/asm-ia64/nodedata.h~pgdat-allocation-and-update-for-ia64-of-memory-hotplug-update-pgdat-address-array include/asm-ia64/nodedata.h
--- a/include/asm-ia64/nodedata.h~pgdat-allocation-and-update-for-ia64-of-memory-hotplug-update-pgdat-address-array
+++ a/include/asm-ia64/nodedata.h
@@ -46,6 +46,18 @@ struct ia64_node_data {
*/
#define NODE_DATA(nid) (local_node_data->pg_data_ptrs[nid])
+/*
+ * LOCAL_DATA_ADDR - This is to calculate the address of other node's
+ * "local_node_data" at hot-plug phase. The local_node_data
+ * is pointed by per_cpu_page. Kernel usually use it for
+ * just executing cpu. However, when new node is hot-added,
+ * the addresses of local data for other nodes are necessary
+ * to update all of them.
+ */
+#define LOCAL_DATA_ADDR(pgdat) \
+ ((struct ia64_node_data *)((u64)(pgdat) + \
+ L1_CACHE_ALIGN(sizeof(struct pglist_data))))
+
#endif /* CONFIG_NUMA */
#endif /* _ASM_IA64_NODEDATA_H */
diff -puN include/linux/memory_hotplug.h~pgdat-allocation-and-update-for-ia64-of-memory-hotplug-update-pgdat-address-array include/linux/memory_hotplug.h
--- a/include/linux/memory_hotplug.h~pgdat-allocation-and-update-for-ia64-of-memory-hotplug-update-pgdat-address-array
+++ a/include/linux/memory_hotplug.h
@@ -91,9 +91,7 @@ static inline pg_data_t *arch_alloc_node
static inline void arch_free_nodedata(pg_data_t *pgdat)
{
}
-static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
-{
-}
+extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
_
Patches currently in -mm which might be from y-goto@xxxxxxxxxxxxxx are
origin.patch
-
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