[PATCH] [2/21] SCSI-ISA-DMA: Add blk_q_mask

[Andi Kleen <andi@xxxxxxxxxxxxxx>]

[Merge note: this patch will be in a SCSI patchkit and in the core
mask allocator patchkit. They are equivalent. If one of them 
is merged first simply drop it in the other]

Converts the queue bounce_pfn to a DMA mask suitable for the mask allocator

Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andi Kleen <andi@xxxxxxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>

---
 include/linux/blkdev.h |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux/include/linux/blkdev.h
===================================================================
--- linux.orig/include/linux/blkdev.h
+++ linux/include/linux/blkdev.h
@@ -890,6 +890,11 @@ static inline unsigned int block_size(st
 	return bdev->bd_block_size;
 }
 
+static inline u64 blk_q_mask(struct request_queue *q)
+{
+	return ~(-1LL << (PAGE_SHIFT + fls64(q->bounce_pfn)));
+}
+
 typedef struct {struct page *v;} Sector;
 
 unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
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