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mm/zonelist: enumerate zonelists array index 

Hardcoding index to zonelists array in gfp_zonelist() is not a good
idea, let's enumerate it to improve readability.

No functional change.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix CONFIG_NUMA=n build]
[n-horiguchi@ah.jp.nec.com: fix warning in comparing enumerator]
Signed-off-by: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yaowei Bai 2016-01-14 15:19:00 -08:00 committed by Linus Torvalds
parent 06640290bf
commit c00eb15a89
3 changed files with 18 additions and 20 deletions
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9
include/linux/gfp.h
View File

@ -384,10 +384,11 @@ static inline enum zone_type gfp_zone(gfp_t flags)
static inline int gfp_zonelist(gfp_t flags)
{
if (IS_ENABLED(CONFIG_NUMA) && unlikely(flags & __GFP_THISNODE))
return 1;
return 0;
#ifdef CONFIG_NUMA
if (unlikely(flags & __GFP_THISNODE))
return ZONELIST_NOFALLBACK;
#endif
return ZONELIST_FALLBACK;
}
/*

20
include/linux/mmzone.h
View File

@ -571,19 +571,17 @@ static inline bool zone_is_empty(struct zone *zone)
/* Maximum number of zones on a zonelist */
#define MAX_ZONES_PER_ZONELIST (MAX_NUMNODES * MAX_NR_ZONES)
enum {
ZONELIST_FALLBACK, /* zonelist with fallback */
#ifdef CONFIG_NUMA
/*
* The NUMA zonelists are doubled because we need zonelists that restrict the
* allocations to a single node for __GFP_THISNODE.
*
* [0] : Zonelist with fallback
* [1] : No fallback (__GFP_THISNODE)
*/
#define MAX_ZONELISTS 2
#else
#define MAX_ZONELISTS 1
/*
* The NUMA zonelists are doubled because we need zonelists that
* restrict the allocations to a single node for __GFP_THISNODE.
*/
ZONELIST_NOFALLBACK, /* zonelist without fallback (__GFP_THISNODE) */
#endif
MAX_ZONELISTS
};
/*
* This struct contains information about a zone in a zonelist. It is stored

9
mm/page_alloc.c
View File

@ -4148,8 +4148,7 @@ static void set_zonelist_order(void)
static void build_zonelists(pg_data_t *pgdat)
{
int j, node, load;
enum zone_type i;
int i, node, load;
nodemask_t used_mask;
int local_node, prev_node;
struct zonelist *zonelist;
@ -4169,7 +4168,7 @@ static void build_zonelists(pg_data_t *pgdat)
nodes_clear(used_mask);
memset(node_order, 0, sizeof(node_order));
j = 0;
i = 0;
while ((node = find_next_best_node(local_node, &used_mask)) >= 0) {
/*
@ -4186,12 +4185,12 @@ static void build_zonelists(pg_data_t *pgdat)
if (order == ZONELIST_ORDER_NODE)
build_zonelists_in_node_order(pgdat, node);
else
node_order[j++] = node; /* remember order */
node_order[i++] = node; /* remember order */
}
if (order == ZONELIST_ORDER_ZONE) {
/* calculate node order -- i.e., DMA last! */
build_zonelists_in_zone_order(pgdat, j);
build_zonelists_in_zone_order(pgdat, i);
}
build_thisnode_zonelists(pgdat);