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If writeback isn't configured, then we get the following warning when compiling zram: drivers/block/zram/zram_drv.c:1824:45: warning: unused variable 'zram_wb_devops' [-Wunused-const-variable] Make sure we only define the block_device_operations if that option is enabled. Link: https://lore.kernel.org/lkml/[email protected]/ Reported-by: kernel test robot <[email protected]> Signed-off-by: Jens Axboe <[email protected]>