1 files changed, 32 insertions, 3 deletions

diff --git a/include/asm-x86/sparsemem.h b/include/asm-x86/sparsemem.h
index 3f203b1d9ee8..fa58cd55411a 100644
--- a/include/asm-x86/sparsemem.h
+++ b/include/asm-x86/sparsemem.h
@@ -1,5 +1,34 @@
+#ifndef _ASM_X86_SPARSEMEM_H
+#define _ASM_X86_SPARSEMEM_H
+
+#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
+ *
+ */
+
 #ifdef CONFIG_X86_32
-# include "sparsemem_32.h"
-#else
-# include "sparsemem_64.h"
+# ifdef CONFIG_X86_PAE
+#  define SECTION_SIZE_BITS     30
+#  define MAX_PHYSADDR_BITS     36
+#  define MAX_PHYSMEM_BITS      36
+# else
+#  define SECTION_SIZE_BITS     26
+#  define MAX_PHYSADDR_BITS     32
+#  define MAX_PHYSMEM_BITS      32
+# endif
+#else /* CONFIG_X86_32 */
+# define SECTION_SIZE_BITS      27 /* matt - 128 is convenient right now */
+# define MAX_PHYSADDR_BITS      40
+# define MAX_PHYSMEM_BITS       40
+#endif
+
+#endif /* CONFIG_SPARSEMEM */
 #endif