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authorYasunori Goto <y-goto@jp.fujitsu.com>2006-06-27 05:53:39 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-27 20:32:37 -0400
commit7049027c6f0098eb6b23b8f6ca65a905541faf81 (patch)
treeab5528625be6e79c02767c6d9444599c1980cf0e /include/asm-ia64/nodedata.h
parentae5a2c1c9b2bc3633032f97d02e60ae547a6047c (diff)
[PATCH] pgdat allocation and update for ia64 of memory hotplug: update pgdat address array
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@jp.fujitsu.com> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-ia64/nodedata.h')
-rw-r--r--include/asm-ia64/nodedata.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/asm-ia64/nodedata.h b/include/asm-ia64/nodedata.h
index a140310bf84d..2fb337b0e9b7 100644
--- a/include/asm-ia64/nodedata.h
+++ b/include/asm-ia64/nodedata.h
@@ -46,6 +46,18 @@ struct ia64_node_data {
46 */ 46 */
47#define NODE_DATA(nid) (local_node_data->pg_data_ptrs[nid]) 47#define NODE_DATA(nid) (local_node_data->pg_data_ptrs[nid])
48 48
49/*
50 * LOCAL_DATA_ADDR - This is to calculate the address of other node's
51 * "local_node_data" at hot-plug phase. The local_node_data
52 * is pointed by per_cpu_page. Kernel usually use it for
53 * just executing cpu. However, when new node is hot-added,
54 * the addresses of local data for other nodes are necessary
55 * to update all of them.
56 */
57#define LOCAL_DATA_ADDR(pgdat) \
58 ((struct ia64_node_data *)((u64)(pgdat) + \
59 L1_CACHE_ALIGN(sizeof(struct pglist_data))))
60
49#endif /* CONFIG_NUMA */ 61#endif /* CONFIG_NUMA */
50 62
51#endif /* _ASM_IA64_NODEDATA_H */ 63#endif /* _ASM_IA64_NODEDATA_H */