bootmem: Reimplement __absent_pages_in_range() using for_each_mem_pfn_range()

__absent_pages_in_range() was needlessly complex.  Reimplement it
using for_each_mem_pfn_range().

Also, update zone_absent_pages_in_node() such that it doesn't call
__absent_pages_in_range() with @zone_start_pfn which is larger than
@zone_end_pfn.

Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/1310460395-30913-3-git-send-email-tj@kernel.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, 12 insertions, 42 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 69fffabf61b7..3092a97268d1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4044,46 +4044,16 @@ unsigned long __meminit __absent_pages_in_range(int nid,
                                 unsigned long range_start_pfn,
                                 unsigned long range_end_pfn)
 {
-        int i = 0;
-        unsigned long prev_end_pfn = 0, hole_pages = 0;
-        unsigned long start_pfn;
-
-        /* Find the end_pfn of the first active range of pfns in the node */
-        i = first_active_region_index_in_nid(nid);
-        if (i == -1)
-                return 0;
-
-        prev_end_pfn = min(early_node_map[i].start_pfn, range_end_pfn);
-
-        /* Account for ranges before physical memory on this node */
-        if (early_node_map[i].start_pfn > range_start_pfn)
-                hole_pages = prev_end_pfn - range_start_pfn;
-
-        /* Find all holes for the zone within the node */
-        for (; i != -1; i = next_active_region_index_in_nid(i, nid)) {
-
-                /* No need to continue if prev_end_pfn is outside the zone */
-                if (prev_end_pfn >= range_end_pfn)
-                        break;
-
-                /* Make sure the end of the zone is not within the hole */
-                start_pfn = min(early_node_map[i].start_pfn, range_end_pfn);
-                prev_end_pfn = max(prev_end_pfn, range_start_pfn);
+        unsigned long nr_absent = range_end_pfn - range_start_pfn;
+        unsigned long start_pfn, end_pfn;
+        int i;
 
-                /* Update the hole size cound and move on */
-                if (start_pfn > range_start_pfn) {
-                        BUG_ON(prev_end_pfn > start_pfn);
-                        hole_pages += start_pfn - prev_end_pfn;
-                }
-                prev_end_pfn = early_node_map[i].end_pfn;
+        for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
+                start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn);
+                end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn);
+                nr_absent -= end_pfn - start_pfn;
         }
-
-        /* Account for ranges past physical memory on this node */
-        if (range_end_pfn > prev_end_pfn)
-                hole_pages += range_end_pfn -
-                                max(range_start_pfn, prev_end_pfn);
-
-        return hole_pages;
+        return nr_absent;
 }
 
 /**
@@ -4104,14 +4074,14 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
                                         unsigned long zone_type,
                                         unsigned long *ignored)
 {
+        unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type];
+        unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type];
         unsigned long node_start_pfn, node_end_pfn;
         unsigned long zone_start_pfn, zone_end_pfn;
 
         get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn);
-        zone_start_pfn = max(arch_zone_lowest_possible_pfn[zone_type],
-                                                        node_start_pfn);
-        zone_end_pfn = min(arch_zone_highest_possible_pfn[zone_type],
-                                                        node_end_pfn);
+        zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high);
+        zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high);
 
         adjust_zone_range_for_zone_movable(nid, zone_type,
                         node_start_pfn, node_end_pfn,