Hello, this fixes a regression that resurfaced in hugetlbfs code after we fixed it for the core VM a few months ago. This is only reproducible doing postcopy live migration of KVM (the only user of FOLL_NOWAIT) if backed by hugetlbfs memory. It's unrelated to userfaultfd, but userfaultfd reproduces it easily because it's an heavy user of VM_FAULT_RETRY retvals.
Thanks, Andrea Andrea Arcangeli (1): mm/hugetlb.c: teach follow_hugetlb_page() to handle FOLL_NOWAIT mm/hugetlb.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
