[SRU][D / B aws-edge][aws][PULL] proper hibernation support

[Andrea Righi]

BugLink: https://bugs.launchpad.net/bugs/1858618
BugLink: https://bugs.launchpad.net/bugs/1831940

The following patches are required to properly support hibernation with
bionic:linux-aws-edge / disco:linux-aws.

The most important patch is "PM / hibernate: memory_bm_find_bit():
Tighten node optimisation": this is a very critical bug fix for
hibernation that prevents potential memory corruptions on resume.

The two SAUCE patches are required to improve swapoff performance after
a successful resume.

All these patches have been tested in the AWS environment with positive
results.

The following changes since commit 0f84693e79c7c596ac56d952851e0b9527679689:

  UBUNTU: Ubuntu-aws-edge-5.0.0-1019.21~18.04.1 (2019-10-03 00:49:16 -0400)

are available in the Git repository at:

  git://git.launchpad.net/~arighi/+git/bionic-linux aws-edge-arighi

for you to fetch changes up to 65f789bf0216b2daf6377c2ba51d94cb8b76e5e1:

  UBUNTU SAUCE [aws]: mm: swap: improve swap readahead heuristic (2020-01-16 15:19:46 +0100)

----------------------------------------------------------------
Andrea Righi (2):
      UBUNTU SAUCE [aws] PM / hibernate: reduce memory pressure during image writing
      UBUNTU SAUCE [aws]: mm: swap: improve swap readahead heuristic

Andy Whitcroft (1):
      PM / hibernate: memory_bm_find_bit(): Tighten node optimisation

Vineeth Remanan Pillai (2):
      mm: refactor swap-in logic out of shmem_getpage_gfp
      mm: rid swapoff of quadratic complexity

 include/linux/frontswap.h |   7 +
 include/linux/shmem_fs.h  |   3 +-
 kernel/power/snapshot.c   |   9 +-
 kernel/power/swap.c       |  24 +-
 mm/shmem.c                | 716 +++++++++++++++++++++++++---------------------
 mm/swap.c                 |   2 +-
 mm/swap_state.c           |  60 +---
 mm/swapfile.c             | 433 +++++++++++-----------------
 8 files changed, 582 insertions(+), 672 deletions(-)