On Tue, May 23, 2023 at 04:30:51AM +0100, Matthew Wilcox wrote: > AFAICT (the code went through some metamorphoses in the intervening > twenty years), the last use of it ended up in current_may_throttle(), > and it was removed in March 2022 by Neil Brown in commit b9b1335e6403. > Since then, there have been no users of task->backing_dev_info, and I'm > pretty sure it can go away. Oh, nice. I hadn't noticed it finally went away. The next iteration of the series will just remove it.