zram: ZRAM_DEF_COMP should depend on ZRAM

When Compressed RAM block device support is disabled, the
CONFIG_ZRAM_DEF_COMP symbol still ends up in the generated config file:

    CONFIG_ZRAM_DEF_COMP="unset-value"

While this causes no real harm, avoid polluting the config file by
adding a dependency on ZRAM.

Link: https://lkml.kernel.org/r/64e05bad68a9bd5cc322efd114a04d25de525940.1730807319.git.geert@linux-m68k.org
Fixes: 917a59e81c34 ("zram: introduce custom comp backends API")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig
index 6aea609b795c2f36be8a92c98cc510d7ca0c49eb..402b7b17586328078ba12fee78a6a7c052ee6eb4 100644 (file)
--- a/drivers/block/zram/Kconfig
+++ b/drivers/block/zram/Kconfig
@@ -94,6 +94,7 @@ endchoice
 
 config ZRAM_DEF_COMP
        string
+       depends on ZRAM
        default "lzo-rle" if ZRAM_DEF_COMP_LZORLE
        default "lzo" if ZRAM_DEF_COMP_LZO
        default "lz4" if ZRAM_DEF_COMP_LZ4