From: Ira Weiny <ira.we...@intel.com> NOTE: This series depends on my clean up patch to remove the write parameter from gup_fast_permitted()[1]
HFI1 uses get_user_pages_fast() due to it performance advantages. Like RDMA, HFI1 pages can be held for a significant time. But get_user_pages_fast() does not protect against mapping of FS DAX pages. Introduce a get_user_pages_fast_longterm() which retains the performance while also adding the FS DAX checks. XDP has also shown interest in using this functionality.[2] [1] https://lkml.org/lkml/2019/2/11/237 [2] https://lkml.org/lkml/2019/2/11/1789 Ira Weiny (3): mm/gup: Change "write" parameter to flags mm/gup: Introduce get_user_pages_fast_longterm() IB/HFI1: Use new get_user_pages_fast_longterm() drivers/infiniband/hw/hfi1/user_pages.c | 2 +- include/linux/mm.h | 8 ++ mm/gup.c | 152 ++++++++++++++++-------- 3 files changed, 114 insertions(+), 48 deletions(-) -- 2.20.1
