ZSMALLOC depends on MMU so ZRAM should also depend on MMU since 'select' does not follow any dependency chains. Fixes this Kconfig warning: WARNING: unmet direct dependencies detected for ZSMALLOC Depends on [n]: MMU [=n] Selected by [y]: - ZRAM [=y] && BLK_DEV [=y] && BLOCK [=y] && SYSFS [=y] && (CRYPTO_LZO [=y] || CRYPTO_ZSTD [=m] || CRYPTO_LZ4 [=m] || CRYPTO_LZ4HC [=n] || CRYPTO_842 [=n]) Fixes: b3fbd58fcbb10 ("mm: Kconfig: simplify zswap configuration") Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Minchan Kim <minchan@xxxxxxxxxx> Cc: Nitin Gupta <ngupta@xxxxxxxxxx> Cc: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx> Cc: Jens Axboe <axboe@xxxxxxxxx> Cc: linux-block@xxxxxxxxxxxxxxx Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/block/zram/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/block/zram/Kconfig +++ b/drivers/block/zram/Kconfig @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 config ZRAM tristate "Compressed RAM block device support" - depends on BLOCK && SYSFS + depends on BLOCK && SYSFS && MMU depends on CRYPTO_LZO || CRYPTO_ZSTD || CRYPTO_LZ4 || CRYPTO_LZ4HC || CRYPTO_842 select ZSMALLOC help