block: Fix bounce_pfn setting

Correct stacking bounce_pfn limit setting and prevent warnings on
32-bit.
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>

block/blk-settings.c

@@ -112,7 +112,7 @@ void blk_set_default_limits(struct queue_limits *lim)
 	lim->max_segment_size = MAX_SEGMENT_SIZE;
 	lim->max_sectors = lim->max_hw_sectors = SAFE_MAX_SECTORS;
 	lim->logical_block_size = lim->physical_block_size = lim->io_min = 512;
-	lim->bounce_pfn = BLK_BOUNCE_ANY;
+	lim->bounce_pfn = (unsigned long)(BLK_BOUNCE_ANY >> PAGE_SHIFT);
 	lim->alignment_offset = 0;
 	lim->io_opt = 0;
 	lim->misaligned = 0;