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zram: only make zram_wb_devops for CONFIG_ZRAM_WRITEBACK

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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/202111261614.gCJMqcyh-lkp@intel.com/
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-11-26 09:57:32 -07:00
parent 98b26a0e76
commit d422f40163
1 changed files with 2 additions and 0 deletions
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2
drivers/block/zram/zram_drv.c
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@ -1853,12 +1853,14 @@ static const struct block_device_operations zram_devops = {
.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);