There is no need to recalcurate pages_per_zspage in runtime.  Just use
class->pages_per_zspage to avoid unnecessary runtime overhead.
Signed-off-by: NMinchan Kim <minchan@kernel.org>
Acked-by: NSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>