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-rw-r--r--arch/i386/mm/discontig.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
index 1726b40..85d2fcb 100644
--- a/arch/i386/mm/discontig.c
+++ b/arch/i386/mm/discontig.c
@@ -146,6 +146,21 @@ static void __init find_max_pfn_node(int nid)
BUG();
}
+/* Find the owning node for a pfn. */
+int early_pfn_to_nid(unsigned long pfn)
+{
+ int nid;
+
+ for_each_node(nid) {
+ if (node_end_pfn[nid] == 0)
+ break;
+ if (node_start_pfn[nid] <= pfn && node_end_pfn[nid] >= pfn)
+ return nid;
+ }
+
+ return 0;
+}
+
/*
* Allocate memory for the pg_data_t for this node via a crude pre-bootmem
* method. For node zero take this from the bottom of memory, for
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