[AGPGART] Fix overflow on machines with >4GB

From Marcelo E Magallon.

[AGPGART] Fix overflow on machines with >4GB
From Marcelo E Magallon.
c36cf3b5 · Dave Jones · Dave Jones · 4a0ea4c3 · c36cf3b5
Commit c36cf3b5 authored Aug 13, 2003 by Dave Jones Committed by Dave Jones Aug 13, 2003
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drivers/char/agp/backend.c drivers/char/agp/backend.c +5 -1

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--- a/drivers/char/agp/backend.c
+++ b/drivers/char/agp/backend.c
@@ -106,7 +106,11 @@ static int agp_find_max(void)
 {
 	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) && (index < 8))