Please add zram and zswap to the kernel config/build

[mbohun]

NO zram or zswap at the moment

pinetabv:~$ uname -a
Linux pinetabv 5.15.128 #1 SMP Mon Aug 28 15:27:08 UTC 2023 riscv64 riscv64 riscv64 GNU/Linux

pinetabv:~$ zcat /proc/config.gz | grep -i zram
pinetabv:~$ zcat /proc/config.gz | grep -i zswap              
pinetabv:~$ 

• https://cateee.net/lkddb/web-lkddb/ZRAM.html

CONFIG_ZRAM: Compressed RAM block device support
General informations
The Linux kernel configuration item CONFIG_ZRAM has multiple definitions:

Compressed RAM block device support found in drivers/block/zram/Kconfig
The configuration item CONFIG_ZRAM:

prompt: Compressed RAM block device support
type: tristate
depends on: ( CONFIG_BLOCK && CONFIG_SYSFS && CONFIG_MMU ) && ( CONFIG_CRYPTO_LZO || CONFIG_CRYPTO_ZSTD || CONFIG_CRYPTO_LZ4 || CONFIG_CRYPTO_LZ4HC || CONFIG_CRYPTO_842 )
defined in drivers/block/zram/Kconfig
found in Linux kernels: 3.14–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.5
modules built: zram, zram

Unfortunately none of the ( CONFIG_CRYPTO_LZO || CONFIG_CRYPTO_ZSTD || CONFIG_CRYPTO_LZ4 || CONFIG_CRYPTO_LZ4HC || CONFIG_CRYPTO_842 ) is enabled at the moment:

pinetabv:~$ zcat /proc/config.gz | grep -i config_crypto_lzo
# CONFIG_CRYPTO_LZO is not set
pinetabv:~$ zcat /proc/config.gz | grep -i config_crypto_zstd
# CONFIG_CRYPTO_ZSTD is not set
pinetabv:~$ zcat /proc/config.gz | grep -i config_crypto_lz4 
# CONFIG_CRYPTO_LZ4 is not set
# CONFIG_CRYPTO_LZ4HC is not set
pinetabv:~$ zcat /proc/config.gz | grep -i config_crypto_lz4hc
# CONFIG_CRYPTO_LZ4HC is not set
pinetabv:~$ zcat /proc/config.gz | grep -i config_crypto_842  
# CONFIG_CRYPTO_842 is not set

Please enable: CONFIG_CRYPTO_LZO, CONFIG_CRYPTO_ZSTD, CONFIG_CRYPTO_LZ4, CONFIG_CRYPTO_LZ4HC, CONFIG_CRYPTO_842 in the kernel config, and that in turn should make available CONFIG_ZRAM and then set CONFIG_ZRAM=y.

Here is an example from PineTab2 /proc/config.gz for reference:

[root@danctnix mbohun]# zcat /proc/config.gz | grep -i zram
CONFIG_ZRAM=y
# CONFIG_ZRAM_DEF_COMP_LZORLE is not set
CONFIG_ZRAM_DEF_COMP_ZSTD=y
# CONFIG_ZRAM_DEF_COMP_LZ4 is not set
# CONFIG_ZRAM_DEF_COMP_LZO is not set
# CONFIG_ZRAM_DEF_COMP_LZ4HC is not set
CONFIG_ZRAM_DEF_COMP="zstd"
CONFIG_ZRAM_WRITEBACK=y
CONFIG_ZRAM_MEMORY_TRACKING=y
CONFIG_ZRAM_MULTI_COMP=y

[root@danctnix mbohun]# zcat /proc/config.gz | grep -i zswap
CONFIG_ZSWAP=y
CONFIG_ZSWAP_DEFAULT_ON=y
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_DEFLATE is not set
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZO is not set
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_842 is not set
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZ4 is not set
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZ4HC is not set
CONFIG_ZSWAP_COMPRESSOR_DEFAULT_ZSTD=y
CONFIG_ZSWAP_COMPRESSOR_DEFAULT="zstd"
# CONFIG_ZSWAP_ZPOOL_DEFAULT_ZBUD is not set
# CONFIG_ZSWAP_ZPOOL_DEFAULT_Z3FOLD is not set
CONFIG_ZSWAP_ZPOOL_DEFAULT_ZSMALLOC=y
CONFIG_ZSWAP_ZPOOL_DEFAULT="zsmalloc"

[root@danctnix mbohun]# zcat /proc/config.gz | grep -i config_crypto_zs
CONFIG_CRYPTO_ZSTD=y
[root@danctnix mbohun]# zcat /proc/config.gz | grep -i config_crypto_lzo
CONFIG_CRYPTO_LZO=y
[root@danctnix mbohun]# zcat /proc/config.gz | grep -i config_crypto_zstd
CONFIG_CRYPTO_ZSTD=y
[root@danctnix mbohun]# zcat /proc/config.gz | grep -i config_crypto_lz4
CONFIG_CRYPTO_LZ4=y
CONFIG_CRYPTO_LZ4HC=m
[root@danctnix mbohun]# zcat /proc/config.gz | grep -i config_crypto_lz4hc
CONFIG_CRYPTO_LZ4HC=m
[root@danctnix mbohun]# zcat /proc/config.gz | grep -i config_crypto_842
# CONFIG_CRYPTO_842 is not set