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Mark Johnston authored
The per-domain partpop queue is locked by the combination of the per-domain lock and individual reservation mutexes. vm_reserv_reclaim_contig() scans the queue looking for partially populated reservations that can be reclaimed in order to satisfy the caller's allocation. During the scan, we drop the per-domain lock. At this point, the rvn pointer may be invalidated. Take care to load rvn after re-acquiring the per-domain lock. While here, simplify the condition used to check whether a reservation was dequeued while the per-domain lock was dropped. Reviewed by: alc, kib Reported by: gallatin Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D29203 (cherry picked from commit 968079f2)
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