zram: only make zram_wb_devops for CONFIG_ZRAM_WRITEBACK
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/202111261614.gCJMqcyh-lkp@intel.com/
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 08d7953..2507112 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1853,12 +1853,14 @@
.owner = THIS_MODULE
};
+#ifdef CONFIG_ZRAM_WRITEBACK
static const struct block_device_operations zram_wb_devops = {
.open = zram_open,
.submit_bio = zram_submit_bio,
.swap_slot_free_notify = zram_slot_free_notify,
.owner = THIS_MODULE
};
+#endif
static DEVICE_ATTR_WO(compact);
static DEVICE_ATTR_RW(disksize);
