kconfig: use lz4kd default

arch/arm64/configs/m1721_defconfig

@@ -292,6 +292,9 @@ CONFIG_LZO_COMPRESS=y
 CONFIG_LZO_DECOMPRESS=y
 CONFIG_CRYPTO_LZ4=y
 CONFIG_LZ4_COMPRESS=y
+CONFIG_LZ4_DECOMPRESS=y
+CONFIG_ZRAM_DEF_COMP=lz4kd
+CONFIG_ZRAM_DEF_COMP_LZ4KD=y
 CONFIG_CRYPTO_LZ4HC=y
 CONFIG_LZ4HC_COMPRESS=y
 CONFIG_CRYPTO_LZ4KD=y

drivers/block/zram/Kconfig

@@ -1,7 +1,7 @@
 config ZRAM
 	tristate "Compressed RAM block device support"
 	depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO
-	select CRYPTO_LZ4
+	depends on CRYPTO_LZO || CRYPTO_ZSTD || CRYPTO_LZ4 || CRYPTO_LZ4HC || CRYPTO_LZ4KD || CRYPTO_842
 	default n
 	help
 	  Creates virtual block devices called /dev/zramX (X = 0, 1, ...).
@@ -13,6 +13,51 @@ config ZRAM
 	  disks and maybe many more.
 
 	  See Documentation/blockdev/zram.txt for more information.
+
+choice
+	prompt "Default zram compressor"
+	default ZRAM_DEF_COMP_LZORLE
+	depends on ZRAM
+
+config ZRAM_DEF_COMP_LZORLE
+	bool "lzo-rle"
+	depends on CRYPTO_LZO
+
+config ZRAM_DEF_COMP_ZSTD
+	bool "zstd"
+	depends on CRYPTO_ZSTD
+
+config ZRAM_DEF_COMP_LZ4
+	bool "lz4"
+	depends on CRYPTO_LZ4
+
+config ZRAM_DEF_COMP_LZO
+	bool "lzo"
+	depends on CRYPTO_LZO
+
+config ZRAM_DEF_COMP_LZ4HC
+	bool "lz4hc"
+	depends on CRYPTO_LZ4HC
+
+config ZRAM_DEF_COMP_LZ4KD
+	bool "lz4kd"
+	depends on CRYPTO_LZ4KD
+
+config ZRAM_DEF_COMP_842
+	bool "842"
+	depends on CRYPTO_842
+
+endchoice
+
+config ZRAM_DEF_COMP
+	string
+	default "lzo-rle" if ZRAM_DEF_COMP_LZORLE
+	default "zstd" if ZRAM_DEF_COMP_ZSTD
+	default "lz4" if ZRAM_DEF_COMP_LZ4
+	default "lzo" if ZRAM_DEF_COMP_LZO
+	default "lz4hc" if ZRAM_DEF_COMP_LZ4HC
+	default "lz4kd" if ZRAM_DEF_COMP_LZ4KD
+	default "842" if ZRAM_DEF_COMP_842
 
 config ZRAM_WRITEBACK
        bool "Write back incompressible or idle page to backing device"
@@ -41,4 +86,4 @@ config ZRAM_MEMORY_TRACKING
 
 config ZRAM_DEFAULT_COMP_ALGORITHM
 	string "Default ZRAM algorithm"
-	default "lzo"
+	default "lz4kd"