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Subjectblkdev.h paddr overflows
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,

===== 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)

extern int init_emergency_isa_pool(void);
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