--- 2.4.0-test10/arch/i386/kernel/setup.c.~1~	Thu Nov  2 20:58:58 2000
+++ 2.4.0-test10/arch/i386/kernel/setup.c	Wed Nov  8 23:53:52 2000
@@ -642,7 +642,11 @@
  */
 #define VMALLOC_RESERVE	(unsigned long)(128 << 20)
 #define MAXMEM		(unsigned long)(-PAGE_OFFSET-VMALLOC_RESERVE)
+#if HIGHMEM_DEBUG_MERE_MORTALS
+#define MAXMEM_PFN	(max_pfn > PFN_DOWN(MAXMEM) : PFN_DOWN(MAXMEM) : max_pfn / 2)
+#else
 #define MAXMEM_PFN	PFN_DOWN(MAXMEM)
+#endif
 #define MAX_NONPAE_PFN	(1 << 20)
 
 	/*
--- 2.4.0-test10/include/asm-i386/highmem.h.~1~	Sun Nov  5 05:19:01 2000
+++ 2.4.0-test10/include/asm-i386/highmem.h	Wed Nov  8 14:17:16 2000
@@ -28,6 +28,7 @@
 
 /* undef for production */
 #define HIGHMEM_DEBUG 1
+#define HIGHMEM_DEBUG_MERE_MORTALS 1
 
 /* declarations for highmem.c */
 extern unsigned long highstart_pfn, highend_pfn;