bootmem: Replace work_with_active_regions() with for_each_mem_pfn_range()

Callback based iteration is cumbersome and much less useful than
for_each_*() iterator.  This patch implements for_each_mem_pfn_range()
which replaces work_with_active_regions().  All the current users of
work_with_active_regions() are converted.

This simplifies walking over early_node_map and will allow converting
internal logics in page_alloc to use iterator instead of walking
early_node_map directly, which in turn will enable moving node
information to memblock.

powerpc change is only compile tested.

Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/20110714074610.GD3455@htj.dyndns.org
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 4 insertions, 19 deletions

diff --git a/arch/x86/mm/memblock.c b/arch/x86/mm/memblock.c
index e126117d1b03..da0d5c84586e 100644
--- a/arch/x86/mm/memblock.c
+++ b/arch/x86/mm/memblock.c
@@ -115,28 +115,13 @@ static void __init memblock_x86_subtract_reserved(struct range *range, int az)
 	memblock_reserve_reserved_regions();
 }
 
-struct count_data {
-	int nr;
-};
-
-static int __init count_work_fn(unsigned long start_pfn,
-				unsigned long end_pfn, void *datax)
-{
-	struct count_data *data = datax;
-
-	data->nr++;
-
-	return 0;
-}
-
 static int __init count_early_node_map(int nodeid)
 {
-	struct count_data data;
-
-	data.nr = 0;
-	work_with_active_regions(nodeid, count_work_fn, &data);
+	int i, cnt = 0;
 
-	return data.nr;
+	for_each_mem_pfn_range(i, nodeid, NULL, NULL, NULL)
+		cnt++;
+	return cnt;
 }
 
 int __init __get_free_all_memory_range(struct range **rangep, int nodeid,