--- /opt/kernel/linux-2.5.36/include/asm-i386/setup.h	2002-09-16 04:18:40.000000000 +0200
+++ include/asm/setup.h	2002-09-19 08:36:42.000000000 +0200
@@ -13,7 +13,20 @@
 /*
  * Reserved space for vmalloc and iomap - defined in asm/page.h
  */
+#if 0
 #define MAXMEM_PFN	PFN_DOWN(MAXMEM)
+#else
+#define ORDER_DOWN(x)	((x >> (MAX_ORDER-1)) << (MAX_ORDER-1))
+#define MAXMEM_PFN						\
+({								\
+	int __max_pfn;						\
+		if (max_pfn > PFN_DOWN(MAXMEM))			\
+			__max_pfn = PFN_DOWN(MAXMEM);		\
+		else						\
+			__max_pfn = ORDER_DOWN(max_pfn / 5);	\
+	__max_pfn;						\
+})
+#endif
 #define MAX_NONPAE_PFN	(1 << 20)
 
 /*