--- linux-2.4.22-pre6-ac1+p4+4gb/drivers/char/agp/agpgart_be.c.orig	2003-07-30 12:26:18.000000000 +0200
+++ linux-2.4.22-pre6-ac1+p4+4gb/drivers/char/agp/agpgart_be.c	2003-07-30 12:29:03.000000000 +0200
@@ -5655,7 +5655,11 @@
 {
 	long memory, index, result;
 
-	memory = (num_physpages << PAGE_SHIFT) >> 20;
+#if PAGE_SHIFT < 20
+	memory = num_physpages >> (20 - PAGE_SHIFT);
+#else
+	memory = num_physpages << (PAGE_SHIFT - 20);
+#endif
 	index = 1;
 
 	while ((memory > maxes_table[index].mem) &&