[dm-devel] [PATCH V5 4/8] block: move actual bio merge code into __elv_merge

[Christoph Hellwig]

On Sat, Sep 30, 2017 at 07:26:51PM +0800, Ming Lei wrote:
> So that we can reuse __elv_merge() to merge bio
> into requests from sw queue in the following patches.
> 
> No functional change.

There are very few callers of elv_merge, just update the function
with the new parameters instead of introducing __elv_merge.