zram: force disksize setting before using zram
Now zram document syas "set disksize is optional" but partly it's wrong. When you try to use zram firstly after booting, you must set disksize, otherwise zram can't work because zram gendisk's size is 0. But once you do it, you can use zram freely after reset because reset doesn't reset to zero paradoxically. So in this time, disksize setting is optional.:( It's inconsitent for user behavior and not straightforward. This patch forces always setting disksize firstly before using zram. Yes. It changes current behavior so someone could complain when he upgrades zram. Apparently it could be a problem if zram is mainline but it still lives in staging so behavior could be changed for right way to go. Let them excuse. Acked-by: NJerome Marchand <jmarchand@redhat.com> Acked-by: NNitin Gupta <ngupta@vflare.org> Acked-by: NDan Magenheimer <dan.magenheimer@oracle.com> Signed-off-by: NMinchan Kim <minchan@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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