Hi Leon, Jason, Christoph, Maybe I'm overlooking something, but as I wrote in patch 1, it looks like we can simply allow FOLL_FORCE to be passed to gup_fast(). This should fix Leon's reported RDMA failure [1] when using patch 2 by itself. (I've compile- and boot-tested these, and also did short LTP and fio with direct IO tests, but I don't have an Infiniband runtime setup that exercises the umem.c code.) [1] https://lore.kernel.org/r/20191124100724.GH136476@unreal John Hubbard (2): mm/gup: allow FOLL_FORCE for get_user_pages_fast() IB/umem: use get_user_pages_fast() to pin DMA pages drivers/infiniband/core/umem.c | 17 ++++++----------- mm/gup.c | 3 ++- 2 files changed, 8 insertions(+), 12 deletions(-) -- 2.24.0
