[PATCH] V5 ia64 SPARSEMEM - SPARSEMEM code changes

This patch is the minimal set of changes required by ia64 to use SPARSEMEM.

Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/arch/ia64/mm/numa.c b/arch/ia64/mm/numa.c
index 77118bbf3d8b..4e5c8b36ad93 100644
--- a/arch/ia64/mm/numa.c
+++ b/arch/ia64/mm/numa.c
@@ -47,3 +47,27 @@ paddr_to_nid(unsigned long paddr)
 
         return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0);
 }
+
+#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_NUMA)
+/*
+ * Because of holes evaluate on section limits.
+ * If the section of memory exists, then return the node where the section
+ * resides.  Otherwise return node 0 as the default.  This is used by
+ * SPARSEMEM to allocate the SPARSEMEM sectionmap on the NUMA node where
+ * the section resides.
+ */
+int early_pfn_to_nid(unsigned long pfn)
+{
+        int i, section = pfn >> PFN_SECTION_SHIFT, ssec, esec;
+
+        for (i = 0; i < num_node_memblks; i++) {
+                ssec = node_memblk[i].start_paddr >> PA_SECTION_SHIFT;
+                esec = (node_memblk[i].start_paddr + node_memblk[i].size +
+                        ((1L << PA_SECTION_SHIFT) - 1)) >> PA_SECTION_SHIFT;
+                if (section >= ssec && section < esec)
+                        return node_memblk[i].nid;
+        }
+
+        return 0;
+}
+#endif