[PATCH 0/3] Add gup fast + longterm and use it in HFI1

[ira . weiny]

From: Ira Weiny <ira.weiny@xxxxxxxxx>

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