zram: move backing_dev under macro CONFIG_ZRAM_WRITEBACK

backing_dev is never used when not enable CONFIG_ZRAM_WRITEBACK and it's
introduced from writeback feature.  So it's needless also affect
readability in that case.

Link: https://lkml.kernel.org/r/20210521060544.2385-1-zbestahu@gmail.com
Signed-off-by: Yue Hu <huyue2@yulong.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 419a7e8..6e73dc3 100644 (file)
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -113,8 +113,8 @@ struct zram {
         * zram is claimed so open request will be failed
         */
        bool claim; /* Protected by bdev->bd_mutex */
-       struct file *backing_dev;
 #ifdef CONFIG_ZRAM_WRITEBACK
+       struct file *backing_dev;
        spinlock_t wb_limit_lock;
        bool wb_limit_enable;
        u64 bd_wb_limit;