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7049027c6f
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>
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2000 Silicon Graphics, Inc. All rights reserved.
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* Copyright (c) 2002 NEC Corp.
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* Copyright (c) 2002 Erich Focht <efocht@ess.nec.de>
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* Copyright (c) 2002 Kimio Suganuma <k-suganuma@da.jp.nec.com>
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*/
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#ifndef _ASM_IA64_NODEDATA_H
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#define _ASM_IA64_NODEDATA_H
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#include <linux/numa.h>
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#include <asm/percpu.h>
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#include <asm/mmzone.h>
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#ifdef CONFIG_NUMA
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/*
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* Node Data. One of these structures is located on each node of a NUMA system.
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*/
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struct pglist_data;
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struct ia64_node_data {
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short active_cpu_count;
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short node;
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struct pglist_data *pg_data_ptrs[MAX_NUMNODES];
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};
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/*
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* Return a pointer to the node_data structure for the executing cpu.
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*/
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#define local_node_data (local_cpu_data->node_data)
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/*
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* Given a node id, return a pointer to the pg_data_t for the node.
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*
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* NODE_DATA - should be used in all code not related to system
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* initialization. It uses pernode data structures to minimize
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* offnode memory references. However, these structure are not
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* present during boot. This macro can be used once cpu_init
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* completes.
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*/
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#define NODE_DATA(nid) (local_node_data->pg_data_ptrs[nid])
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/*
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* LOCAL_DATA_ADDR - This is to calculate the address of other node's
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* "local_node_data" at hot-plug phase. The local_node_data
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* is pointed by per_cpu_page. Kernel usually use it for
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* just executing cpu. However, when new node is hot-added,
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* the addresses of local data for other nodes are necessary
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* to update all of them.
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*/
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#define LOCAL_DATA_ADDR(pgdat) \
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((struct ia64_node_data *)((u64)(pgdat) + \
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L1_CACHE_ALIGN(sizeof(struct pglist_data))))
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#endif /* CONFIG_NUMA */
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#endif /* _ASM_IA64_NODEDATA_H */
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