[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>
diff --git a/arch/ia64/mm/numa.c b/arch/ia64/mm/numa.c
index 77118bb..4e5c8b3 100644
--- a/arch/ia64/mm/numa.c
+++ b/arch/ia64/mm/numa.c
@@ -47,3 +47,27 @@
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