[RFC Patch 3/3] mm/mm_init: remove special handling absent pages for mirrored_kernelcore

[Wei Yang]

After making Zone Normal/Movable non-overlap, it is not necessary to
calculate absent pages for mirrored_kernelcore specially.

Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: "David Hildenbrand (Arm)" <david@xxxxxxxxxx>
Cc: Yuan Liu <yuan1.liu@xxxxxxxxx>
---
 mm/mm_init.c | 31 +------------------------------
 1 file changed, 1 insertion(+), 30 deletions(-)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index da0e65bf8d02..b34ca1cf117f 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -1195,40 +1195,11 @@ static unsigned long __init zone_absent_pages_in_node(int nid,
 					unsigned long zone_start_pfn,
 					unsigned long zone_end_pfn)
 {
-	unsigned long nr_absent;
-
 	/* zone is empty, we don't have any absent pages */
 	if (zone_start_pfn == zone_end_pfn)
 		return 0;
 
-	nr_absent = __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn);
-
-	/*
-	 * ZONE_MOVABLE handling.
-	 * Treat pages to be ZONE_MOVABLE in ZONE_NORMAL as absent pages
-	 * and vice versa.
-	 */
-	if (mirrored_kernelcore && zone_movable_pfn[nid]) {
-		unsigned long start_pfn, end_pfn;
-		struct memblock_region *r;
-
-		for_each_mem_region(r) {
-			start_pfn = clamp(memblock_region_memory_base_pfn(r),
-					  zone_start_pfn, zone_end_pfn);
-			end_pfn = clamp(memblock_region_memory_end_pfn(r),
-					zone_start_pfn, zone_end_pfn);
-
-			if (zone_type == ZONE_MOVABLE &&
-			    memblock_is_mirror(r))
-				nr_absent += end_pfn - start_pfn;
-
-			if (zone_type == ZONE_NORMAL &&
-			    !memblock_is_mirror(r))
-				nr_absent += end_pfn - start_pfn;
-		}
-	}
-
-	return nr_absent;
+	return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn);
 }
 
 /*
-- 
2.34.1