1 files changed, 26 insertions, 0 deletions

diff --git a/include/asm-x86_64/sparsemem.h b/include/asm-x86_64/sparsemem.h
new file mode 100644
index 000000000000..dabb16714a71
--- /dev/null
+++ b/include/asm-x86_64/sparsemem.h
@@ -0,0 +1,26 @@
+#ifndef _ASM_X86_64_SPARSEMEM_H
+#define _ASM_X86_64_SPARSEMEM_H 1
+
+#ifdef CONFIG_SPARSEMEM
+
+/*
+ * generic non-linear memory support:
+ *
+ * 1) we will not split memory into more chunks than will fit into the flags
+ *    field of the struct page
+ *
+ * SECTION_SIZE_BITS            2^n: size of each section
+ * MAX_PHYSADDR_BITS            2^n: max size of physical address space
+ * MAX_PHYSMEM_BITS             2^n: how much memory we can have in that space
+ *
+ */
+
+#define SECTION_SIZE_BITS       27 /* matt - 128 is convenient right now */
+#define MAX_PHYSADDR_BITS       40
+#define MAX_PHYSMEM_BITS        40
+
+extern int early_pfn_to_nid(unsigned long pfn);
+
+#endif /* CONFIG_SPARSEMEM */
+
+#endif /* _ASM_X86_64_SPARSEMEM_H */