[PATCH v2 0/3] mm/gup: Introduce pin_user_pages_fd() for pinning shmem/hugetlbfs file pages (v2)

[Vivek Kasireddy <vivek.kasireddy@intel.com>]

The first patch introduces pin_user_pages_fd() API and the second
patch shows how the udmabuf driver can use it to longterm-pin the
the pages. The last patch adds two new udmabuf selftests to verify
data coherency after page migration.

v2:
- Updated the first patch to include review feedback from David and
  Jason. The main change in this series is the allocation of page
  in the case of hugetlbfs if it is not found in the page cache.

Cc: David Hildenbrand <david@redhat.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Dongwon Kim <dongwon.kim@intel.com>
Cc: Junxiao Chang <junxiao.chang@intel.com>

Vivek Kasireddy (3):
  mm/gup: Introduce pin_user_pages_fd() for pinning shmem/hugetlbfs file
    pages (v2)
  udmabuf: Pin the pages using pin_user_pages_fd() API (v2)
  selftests/dma-buf/udmabuf: Add tests to verify data after page
    migration

 drivers/dma-buf/udmabuf.c                     |  81 +++++++---
 include/linux/mm.h                            |   2 +
 mm/gup.c                                      |  99 ++++++++++++
 .../selftests/drivers/dma-buf/udmabuf.c       | 151 +++++++++++++++++-
 4 files changed, 308 insertions(+), 25 deletions(-)

-- 
2.39.2