arch/tile: enable ZONE_DMA for tilegx

This is required for PCI root complex legacy support and USB OHCI root
complex support.  With this change tilegx now supports allocating memory
whose PA fits in 32 bits.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c
index a2417a0a8222..ef29d6c5e10e 100644
--- a/arch/tile/mm/init.c
+++ b/arch/tile/mm/init.c
@@ -733,16 +733,15 @@ static void __init set_non_bootmem_pages_init(void)
         for_each_zone(z) {
                 unsigned long start, end;
                 int nid = z->zone_pgdat->node_id;
+#ifdef CONFIG_HIGHMEM
                 int idx = zone_idx(z);
+#endif
 
                 start = z->zone_start_pfn;
-                if (start == 0)
-                        continue;  /* bootmem */
                 end = start + z->spanned_pages;
-                if (idx == ZONE_NORMAL) {
-                        BUG_ON(start != node_start_pfn[nid]);
-                        start = node_free_pfn[nid];
-                }
+                start = max(start, node_free_pfn[nid]);
+                start = max(start, max_low_pfn);
+
 #ifdef CONFIG_HIGHMEM
                 if (idx == ZONE_HIGHMEM)
                         totalhigh_pages += z->spanned_pages;