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[PATCH] define for_each_online_pgdat

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This patch defines for_each_online_pgdat() as a replacement of
for_each_pgdat()

Now, online nodes are managed by node_online_map.  But for_each_pgdat()
uses pgdat_link to iterate over all nodes(pgdat).  This means management
structure for online pgdat is duplicated.

I think using node_online_map for for_each_pgdat() is simple and sane
rather ather than pgdat_link.  New macro is named as
for_each_online_pgdat().  Following patch will fix callers of
for_each_pgdat().

The bootmem allocater uses for_each_pgdat() before pgdat initialization.  I
don't think it's sane.  Following patch will fix it.

Signed-off-by: Yasunori Goto     <y-goto@jp.fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2006-03-27 01:15:57 -08:00 committed by Linus Torvalds
parent a0140c1d85
commit 8357f8695d
2 changed files with 61 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

108
include/linux/mmzone.h
View File

@ -13,6 +13,7 @@
#include <linux/numa.h>
#include <linux/init.h>
#include <linux/seqlock.h>
#include <linux/nodemask.h>
#include <asm/atomic.h>
/* Free memory management - zoned buddy allocator. */
@ -349,57 +350,6 @@ unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);
*/
#define zone_idx(zone) ((zone) - (zone)->zone_pgdat->node_zones)
/**
* for_each_pgdat - helper macro to iterate over all nodes
* @pgdat - pointer to a pg_data_t variable
*
* Meant to help with common loops of the form
* pgdat = pgdat_list;
* while(pgdat) {
* ...
* pgdat = pgdat->pgdat_next;
* }
*/
#define for_each_pgdat(pgdat) \
for (pgdat = pgdat_list; pgdat; pgdat = pgdat->pgdat_next)
/*
* next_zone - helper magic for for_each_zone()
* Thanks to William Lee Irwin III for this piece of ingenuity.
*/
static inline struct zone *next_zone(struct zone *zone)
{
pg_data_t *pgdat = zone->zone_pgdat;
if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
zone++;
else if (pgdat->pgdat_next) {
pgdat = pgdat->pgdat_next;
zone = pgdat->node_zones;
} else
zone = NULL;
return zone;
}
/**
* for_each_zone - helper macro to iterate over all memory zones
* @zone - pointer to struct zone variable
*
* The user only needs to declare the zone variable, for_each_zone
* fills it in. This basically means for_each_zone() is an
* easier to read version of this piece of code:
*
* for (pgdat = pgdat_list; pgdat; pgdat = pgdat->node_next)
* for (i = 0; i < MAX_NR_ZONES; ++i) {
* struct zone * z = pgdat->node_zones + i;
* ...
* }
* }
*/
#define for_each_zone(zone) \
for (zone = pgdat_list->node_zones; zone; zone = next_zone(zone))
static inline int populated_zone(struct zone *zone)
{
return (!!zone->present_pages);
@ -471,6 +421,62 @@ extern struct pglist_data contig_page_data;
#endif /* !CONFIG_NEED_MULTIPLE_NODES */
static inline struct pglist_data *first_online_pgdat(void)
{
return NODE_DATA(first_online_node);
}
static inline struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
{
int nid = next_online_node(pgdat->node_id);
if (nid == MAX_NUMNODES)
return NULL;
return NODE_DATA(nid);
}
/**
* for_each_pgdat - helper macro to iterate over all nodes
* @pgdat - pointer to a pg_data_t variable
*/
#define for_each_online_pgdat(pgdat) \
for (pgdat = first_online_pgdat(); \
pgdat; \
pgdat = next_online_pgdat(pgdat))
/*
* next_zone - helper magic for for_each_zone()
* Thanks to William Lee Irwin III for this piece of ingenuity.
*/
static inline struct zone *next_zone(struct zone *zone)
{
pg_data_t *pgdat = zone->zone_pgdat;
if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
zone++;
else {
pgdat = next_online_pgdat(pgdat);
if (pgdat)
zone = pgdat->node_zones;
else
zone = NULL;
}
return zone;
}
/**
* for_each_zone - helper macro to iterate over all memory zones
* @zone - pointer to struct zone variable
*
* The user only needs to declare the zone variable, for_each_zone
* fills it in.
*/
#define for_each_zone(zone) \
for (zone = (first_online_pgdat())->node_zones; \
zone; \
zone = next_zone(zone))
#ifdef CONFIG_SPARSEMEM
#include <asm/sparsemem.h>
#endif

4
include/linux/nodemask.h
View File

@ -350,11 +350,15 @@ extern nodemask_t node_possible_map;
#define num_possible_nodes() nodes_weight(node_possible_map)
#define node_online(node) node_isset((node), node_online_map)
#define node_possible(node) node_isset((node), node_possible_map)
#define first_online_node first_node(node_online_map)
#define next_online_node(nid) next_node((nid), node_online_map)
#else
#define num_online_nodes() 1
#define num_possible_nodes() 1
#define node_online(node) ((node) == 0)
#define node_possible(node) ((node) == 0)
#define first_online_node 0
#define next_online_node(nid) (MAX_NUMNODES)
#endif
#define any_online_node(mask) \