mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 09:02:00 +00:00
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
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (c) 2000 Silicon Graphics, Inc. All rights reserved.
|
|
* Copyright (c) 2002 NEC Corp.
|
|
* Copyright (c) 2002 Erich Focht <efocht@ess.nec.de>
|
|
* Copyright (c) 2002 Kimio Suganuma <k-suganuma@da.jp.nec.com>
|
|
*/
|
|
#ifndef _ASM_IA64_NODEDATA_H
|
|
#define _ASM_IA64_NODEDATA_H
|
|
|
|
#include <linux/numa.h>
|
|
|
|
#include <asm/percpu.h>
|
|
#include <asm/mmzone.h>
|
|
|
|
#ifdef CONFIG_NUMA
|
|
|
|
/*
|
|
* Node Data. One of these structures is located on each node of a NUMA system.
|
|
*/
|
|
|
|
struct pglist_data;
|
|
struct ia64_node_data {
|
|
short active_cpu_count;
|
|
short node;
|
|
struct pglist_data *pg_data_ptrs[MAX_NUMNODES];
|
|
};
|
|
|
|
|
|
/*
|
|
* Return a pointer to the node_data structure for the executing cpu.
|
|
*/
|
|
#define local_node_data (local_cpu_data->node_data)
|
|
|
|
/*
|
|
* Given a node id, return a pointer to the pg_data_t for the node.
|
|
*
|
|
* NODE_DATA - should be used in all code not related to system
|
|
* initialization. It uses pernode data structures to minimize
|
|
* offnode memory references. However, these structure are not
|
|
* present during boot. This macro can be used once cpu_init
|
|
* completes.
|
|
*/
|
|
#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 */
|