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authorMel Gorman <mel@csn.ul.ie>2008-04-28 02:12:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:18 -0700
commit0e88460da6ab7bb6a7ef83675412ed5b6315d741 (patch)
tree1feb4de2362e4998a0deeab66af1efb9c7b8bb34 /include/linux/gfp.h
parentdac1d27bc8d5ca636d3014ecfdf94407031d1970 (diff)
downloadop-kernel-dev-0e88460da6ab7bb6a7ef83675412ed5b6315d741.zip
op-kernel-dev-0e88460da6ab7bb6a7ef83675412ed5b6315d741.tar.gz
mm: introduce node_zonelist() for accessing the zonelist for a GFP mask
Introduce a node_zonelist() helper function. It is used to lookup the appropriate zonelist given a node and a GFP mask. The patch on its own is a cleanup but it helps clarify parts of the two-zonelist-per-node patchset. If necessary, it can be merged with the next patch in this set without problems. Reviewed-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Christoph Lameter <clameter@sgi.com> Cc: Hugh Dickins <hugh@veritas.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/gfp.h')
-rw-r--r--include/linux/gfp.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index c17ba49..e865d51 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -154,10 +154,15 @@ static inline enum zone_type gfp_zone(gfp_t flags)
/*
* We get the zone list from the current node and the gfp_mask.
* This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
+ * There are many zonelists per node, two for each active zone.
*
* For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
* optimized to &contig_page_data at compile-time.
*/
+static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
+{
+ return NODE_DATA(nid)->node_zonelists + gfp_zone(flags);
+}
#ifndef HAVE_ARCH_FREE_PAGE
static inline void arch_free_page(struct page *page, int order) { }
@@ -178,8 +183,7 @@ static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
if (nid < 0)
nid = numa_node_id();
- return __alloc_pages(gfp_mask, order,
- NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
+ return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
}
#ifdef CONFIG_NUMA
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