mm: use pgdat_end_pfn() to simplify the code in arch

Use "pgdat_end_pfn()" instead of "pgdat->node_start_pfn +
pgdat->node_spanned_pages".  Simplify the code, no functional change.

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 4 insertions, 7 deletions

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index b6f7f43424ec..88504abf5704 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -357,9 +357,7 @@ int vmemmap_find_next_valid_pfn(int node, int i)
 
         end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i];
         end_address = PAGE_ALIGN(end_address);
-
-        stop_address = (unsigned long) &vmem_map[
-                pgdat->node_start_pfn + pgdat->node_spanned_pages];
+        stop_address = (unsigned long) &vmem_map[pgdat_end_pfn(pgdat)];
 
         do {
                 pgd_t *pgd;
diff --git a/arch/metag/mm/init.c b/arch/metag/mm/init.c
index 249fff66add3..3cd6288f65c2 100644
--- a/arch/metag/mm/init.c
+++ b/arch/metag/mm/init.c
@@ -148,7 +148,7 @@ static void __init bootmem_init_one_node(unsigned int nid)
         if (!p->node_spanned_pages)
                 return;
 
-        end_pfn = p->node_start_pfn + p->node_spanned_pages;
+        end_pfn = pgdat_end_pfn(p);
 #ifdef CONFIG_HIGHMEM
         if (end_pfn > max_low_pfn)
                 end_pfn = max_low_pfn;
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 33d67844062c..078d3e00a616 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -938,8 +938,7 @@ static void __init mark_reserved_regions_for_nid(int nid)
                 unsigned long start_pfn = physbase >> PAGE_SHIFT;
                 unsigned long end_pfn = PFN_UP(physbase + size);
                 struct node_active_region node_ar;
-                unsigned long node_end_pfn = node->node_start_pfn +
-                                             node->node_spanned_pages;
+                unsigned long node_end_pfn = pgdat_end_pfn(node);
 
                 /*
                  * Check to make sure that this memblock.reserved area is
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 33890fd267cb..2d089fe2cba9 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -231,7 +231,7 @@ static void __init bootmem_init_one_node(unsigned int nid)
         if (!p->node_spanned_pages)
                 return;
 
-        end_pfn = p->node_start_pfn + p->node_spanned_pages;
+        end_pfn = pgdat_end_pfn(p);
 
         total_pages = bootmem_bootmap_pages(p->node_spanned_pages);