2003/12/09 16:57:53-02:00 wli@holomorphy.com 
   [PATCH] fix 2.4 BLK_BOUNCE_ANY
   The bitshift defining BLK_BOUNCE_ANY can overflow. This patch casts
   to u64 before shifting there as well as in BLK_BOUNCE_HIGH to ensure
   integer overflow does not occur.
   Originally discovered by Zwane Mwaikambo during pgcl development,
   submitted by me to mainline to 2.6, and already included in 2.6.
 include/linux/blkdev.h
   2003/12/08 11:44:17-02:00 wli@holomorphy.com +2 -2
   fix 2.4 BLK_BOUNCE_ANY

diff -Nru a/include/linux/blkdev.h b/include/linux/blkdev.h
--- a/include/linux/blkdev.h	Tue Apr 20 10:39:06 2004
+++ b/include/linux/blkdev.h	Tue Apr 20 10:39:06 2004
@@ -176,8 +176,8 @@
 
 extern unsigned long blk_max_low_pfn, blk_max_pfn;
 
-#define BLK_BOUNCE_HIGH		(blk_max_low_pfn << PAGE_SHIFT)
-#define BLK_BOUNCE_ANY		(blk_max_pfn << PAGE_SHIFT)
+#define BLK_BOUNCE_HIGH		((u64)blk_max_low_pfn << PAGE_SHIFT)
+#define BLK_BOUNCE_ANY		((u64)blk_max_pfn << PAGE_SHIFT)
 
 extern void blk_queue_bounce_limit(request_queue_t *, u64);