[PATCHv2] zram: use notify_free to account all free notifications

[Sergey Senozhatsky]

Hello,

This patch change the way zram uses `notify_free' stat attr. Currently,
this attr accounts only swap free notifications, iow used only when zram
device is a swap device. The patch preserves the existing behaviour and
additionally makes `notify_free' universal, so it's also used by zram to
account REQ_DISCARDs when zram is not used as a swap device.

Please refer to:
https://lkml.org/lkml/2014/9/3/1115

V2:
- fix accounting error found by Minchan Kim.

Please revert 2cbf6f7bea1048ab5 (zram: add num_{discard_req, discarded}
for discard stat) and apply this patch.

Sergey Senozhatsky (1):
  zram: use notify_free to account all free notifications

 Documentation/ABI/testing/sysfs-block-zram | 13 ++++++++-----
 drivers/block/zram/zram_drv.c              |  2 +-
 2 files changed, 9 insertions(+), 6 deletions(-)

-- 
2.1.0.134.gb1ae451

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