As writeback becomes more common there is another shortcoming
that needs to be addressed - compressed data writeback.  Currently
zram does uncompressed data writeback which is not optimal due to
potential CPU and battery wastage.  This series changes suboptimal
uncompressed writeback to a more optimal compressed data writeback.

v1 -> v2:
- made compressed writeback configurable via device attribute
- added missing batch_size documentation
- switched to guard() for init_lock
- more code tweaks and cleanups

Richard Chang (2):
  zram: introduce compressed data writeback
  zram: introduce writeback_compressed device attribute

Sergey Senozhatsky (5):
  zram: document writeback_batch_size
  zram: move bd_stat to writeback section
  zram: rename zram_free_page()
  zram: switch to guard() for init_lock
  zram: consolidate device-attr declarations

 Documentation/ABI/testing/sysfs-block-zram  |  14 +
 Documentation/admin-guide/blockdev/zram.rst |  24 +-
 drivers/block/zram/zram_drv.c               | 589 ++++++++++++--------
 drivers/block/zram/zram_drv.h               |   1 +
 4 files changed, 406 insertions(+), 222 deletions(-)

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2.52.0.487.g5c8c507ade-goog