blkdev.h paddr overflows

[William Lee Irwin III]

This patch, originally from Zwane Mwaikambo for my current page
clustering tree, corrects overflows with pfn's shifted to paddrs.
The portion of the fix casting the pfn's to dma_addr_t, included
here, is applicable to mainline.

Please apply,
Bill

===== include/linux/blkdev.h 1.94 vs edited =====
--- 1.94/include/linux/blkdev.h	Tue Nov 19 17:13:41 2002
+++ edited/include/linux/blkdev.h	Mon Dec 30 11:09:01 2002
@@ -287,8 +287,8 @@
  * BLK_BOUNCE_ANY	: don't bounce anything
  * BLK_BOUNCE_ISA	: bounce pages above ISA DMA boundary
  */
-#define BLK_BOUNCE_HIGH		(blk_max_low_pfn << PAGE_SHIFT)
-#define BLK_BOUNCE_ANY		(blk_max_pfn << PAGE_SHIFT)
+#define BLK_BOUNCE_HIGH		((dma_addr_t)blk_max_low_pfn << PAGE_SHIFT)
+#define BLK_BOUNCE_ANY		((dma_addr_t)blk_max_pfn << PAGE_SHIFT)
 #define BLK_BOUNCE_ISA		(ISA_DMA_THRESHOLD)
 
 extern int init_emergency_isa_pool(void);