On Thu, Jun 29, 2017 at 11:54:17AM -0700, Shaohua Li wrote:

bio_free isn't a good place to free cgroup info. There are a
lot of cases bio is allocated in special way (for example, in stack) and
never gets called by bio_put hence bio_free, we are leaking memory. This
patch moves the free to bio endio, which should be called anyway. The
__bio_free call in bio_free is kept, in case the bio never gets called
bio endio.

Jens already renamed __bio_free to bio_uninit in Linus' tree.

That being said I think we should just kill __bio_free once all
the work is in.  But I think we should defer this post the
initial pull for 4.12-rc to reduce the merge pain.