block: don't hardcode blk_qc_t -> tag mask

Use the shift/mask we use elsewhere.

Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 641e5a3..0fb6584 100644 (file)
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -265,7 +265,7 @@ static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
 
 static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
 {
-       return cookie & 0xffff;
+       return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
 }
 
 #endif /* __LINUX_BLK_TYPES_H */