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Writeback is for incompressible and idle zram pages.

Link: https://lkml.kernel.org/r/20231115024223.4133148-2-senozhatsky@chromium.org

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Dmytro Maluka <dmaluka@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>