On Tue, Feb 25, 2025 at 07:00:42PM +0530, Nilay Shroff wrote: > The bdi->ra_pages could be updated under q->limits_lock because it's > usually calculated from the queue limits by queue_limits_commit_update. > So protect reading/writing the sysfs attribute read_ahead_kb using > q->limits_lock instead of q->sysfs_lock. Please add a comment near limits_lock that mentions that the lock protects the limits and read_ahead_kb field. I should have probably done the former myself when adding it, but now that it also protects a non-obvious field we really need it.
