Re: [dm-devel] [RFC][PATCH] Simplify dm_get_device restriction combining

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Christophe Saout wrote:
Hi,

I know this doesn't make the problem go away, but it looks much simpler
this way and removes unnecessary code duplication:

- rs->max_phys_segments =
-			min_not_zero(rs->max_phys_segments,
-				     q->max_phys_segments);
-
-		rs->max_hw_segments =
-			min_not_zero(rs->max_hw_segments, q->max_hw_segments);
-
-		rs->hardsect_size = max(rs->hardsect_size, q->hardsect_size);
-
-		rs->max_segment_size =
-			min_not_zero(rs->max_segment_size, q->max_segment_size);
-
-		rs->seg_boundary_mask =
-			min_not_zero(rs->seg_boundary_mask,
-				     q->seg_boundary_mask);
+		/*
+		 * Combine the device limits low.
+		 */
+		combine_restrictions_low(lrs, &hrs);
 	}


If you want to remove even more code duplication, could dm use blk_queue_stack_limits? The only major difference seems to be that combine_restrictions_low copies seg_boundary_mask and blk_queue_stack_limits doesn't.

Mike



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