ZRAM_LOGICAL_BLOCK_SHIFT   27 drivers/block/zram/zram_drv.h #define ZRAM_LOGICAL_BLOCK_SIZE	(1 << ZRAM_LOGICAL_BLOCK_SHIFT)
ZRAM_LOGICAL_BLOCK_SHIFT   29 drivers/block/zram/zram_drv.h 	(1 << (ZRAM_LOGICAL_BLOCK_SHIFT - SECTOR_SHIFT))