Merge tag 'v5.1-rc5' into for-5.2/block

Pull in v5.1-rc5 to resolve two conflicts. One is in BFQ, in just
a comment, and is trivial. The other one is a conflict due to a
later fix in the bio multi-page work, and needs a bit more care.

* tag 'v5.1-rc5': (476 commits)
  Linux 5.1-rc5
  fs: prevent page refcount overflow in pipe_buf_get
  mm: prevent get_user_pages() from overflowing page refcount
  mm: add 'try_get_page()' helper function
  mm: make page ref count overflow check tighter and more explicit
  clk: imx: Fix PLL_1416X not rounding rates
  clk: mediatek: fix clk-gate flag setting
  arm64: futex: Fix FUTEX_WAKE_OP atomic ops with non-zero result value
  iommu/amd: Set exclusion range correctly
  clang-format: Update with the latest for_each macro list
  perf/core: Fix perf_event_disable_inatomic() race
  block: fix the return errno for direct IO
  Revert "SUNRPC: Micro-optimise when the task is known not to be sleeping"
  NFSv4.1 fix incorrect return value in copy_file_range
  xprtrdma: Fix helper that drains the transport
  NFS: Fix handling of reply page vector
  NFS: Forbid setting AF_INET6 to "struct sockaddr_in"->sin_family.
  dma-debug: only skip one stackframe entry
  platform/x86: pmc_atom: Drop __initconst on dmi table
  nvmet: fix discover log page when offsets are used
  ...

Signed-off-by: Jens Axboe <axboe@kernel.dk>