The HMM_FAULT_ALLOW_RETRY isn't used anywhere in the tree. Remove it and
the weird -EAGAIN handling where handle_mm_fault() drops the mmap_sem.
Link: https://lore.kernel.org/r/20200316135310.899364-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>