On Fri 28-08-20 17:27:45, SeongJae Park wrote:
c3dbe541ef77 ("blktrace: Avoid sparse warnings when assigning q->blk_trace") # commit date: 2020-06-17, author: Jan Kara jack@suse.cz # mentions 'blktrace: Protect q->blk_trace with RCU'
Backporting this is not needed. As the changelog states, it fixes only sparse warnings, not real bugs...
Honza