Oops, this is broken, I'll send a v2 soon.
On Thu, 22 Oct 2020 at 17:11, Rui Salvaterra <rsalvaterra@xxxxxxxxx> wrote:
>
> There's nothing special about zram and lzo. It works just fine without it, so
> as long as at least one of the other supported compression algorithms is
> selected.
>
> Additionally, drop the explicit dependency from CRYPTO, as it's implied by the
> selection of the algorithms themselves.
>
> Signed-off-by: Rui Salvaterra <rsalvaterra@xxxxxxxxx>
> ---
> drivers/block/zram/Kconfig | 8 ++++++--
> drivers/block/zram/zcomp.c | 2 ++
> 2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig
> index fe7a4b7d30cf..2641b86f8677 100644
> --- a/drivers/block/zram/Kconfig
> +++ b/drivers/block/zram/Kconfig
> @@ -1,8 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0
> config ZRAM
> tristate "Compressed RAM block device support"
> - depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO
> - select CRYPTO_LZO
> + depends on BLOCK && SYSFS && ZSMALLOC
> help
> Creates virtual block devices called /dev/zramX (X = 0, 1, ...).
> Pages written to these disks are compressed and stored in memory
> @@ -37,3 +36,8 @@ config ZRAM_MEMORY_TRACKING
> /sys/kernel/debug/zram/zramX/block_state.
>
> See Documentation/admin-guide/blockdev/zram.rst for more information.
> +
> +config ZRAM_AUTOSEL_ALGO
> + def_bool y
> + depends on ZRAM && !(CRYPTO_LZ4 || CRYPTO_LZ4HC || CRYPTO_842 || CRYPTO_ZSTD)
> + select CRYPTO_LZO
> diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
> index 33e3b76c4fa9..052aa3f65514 100644
> --- a/drivers/block/zram/zcomp.c
> +++ b/drivers/block/zram/zcomp.c
> @@ -15,8 +15,10 @@
> #include "zcomp.h"
>
> static const char * const backends[] = {
> +#if IS_ENABLED(CONFIG_CRYPTO_LZO)
> "lzo",
> "lzo-rle",
> +#endif
> #if IS_ENABLED(CONFIG_CRYPTO_LZ4)
> "lz4",
> #endif
> --
> 2.28.0
>
