On Fri, Dec 25, 2020 at 12:02 PM Tian Tao [off-list ref] wrote:

patch #1 add a flag to zpool, then zswap used to determine if zpool
drivers such as zbud/z3fold/zsmalloc whether can sleep in atoimc context.
patch #2 set flag sleep_mapped to true indicates that zbud/z3fold can
sleep in atomic context. zsmalloc didin't support sleep in atomic context,
so not set that flag to true.

Tian Tao (2):
  mm/zswap: add the flag can_sleep_mapped
  mm: set the sleep_mapped to true for zbud and z3fold

 include/linux/zpool.h |  3 +++
 mm/z3fold.c           |  1 +
 mm/zbud.c             |  1 +
 mm/zpool.c            | 13 +++++++++++++
 mm/zswap.c            | 50 +++++++++++++++++++++++++++++++++++++++++++++-----
 5 files changed, 63 insertions(+), 5 deletions(-)

Haven't been able to actually test these yet, but looks good to me so far, so

Reviewed-by: Vitaly Wool <redacted>

Please wait a bit for Mike, Sebastian or me to actually test this.
Also, keep them CC'd explicitly if you are to come up with a new
version for some reason.

Best regards,
   Vitaly