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authorBob Picco <bob.picco@hp.com>2005-10-04 15:13:57 -0400
committerTony Luck <tony.luck@intel.com>2005-10-04 13:21:38 -0700
commit2d4b1fa234417b902c9d3034442387c1805bfa7b (patch)
tree2ed92c7f82eec32a86f2047ac9e9534d7912e305 /arch/ia64/mm/numa.c
parent1be7d9935b9c7fb9bd5964bfaf3ac543381277db (diff)
downloadlinux-2.6.38-lt-ux500-2d4b1fa234417b902c9d3034442387c1805bfa7b.tar.gz
[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>
Diffstat (limited to 'arch/ia64/mm/numa.c')
-rw-r--r--arch/ia64/mm/numa.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/ia64/mm/numa.c b/arch/ia64/mm/numa.c
index 77118bbf3d8..4e5c8b36ad9 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