configs: Enable more ZRAM backends

6.12 kernel reworked how ZRAM backends were configured.
Let's enable the ones we've lost.

I've chosen zstd as the default.

6.6 kernel supported:
$ cat /sys/block/zram0/comp_algorithm
[lzo-rle] lzo lz4 zstd

6.12 currently supports:
$ cat /sys/block/zram0/comp_algorithm
[lzo-rle] lzo

With this PR 6.12 supports:
$ cat /sys/block/zram0/comp_algorithm
lzo-rle lzo lz4 [zstd]

See: https://forums.raspberrypi.com/viewtopic.php?p=2296678#p2296678

Signed-off-by: Dom Cobley <[email protected]>

Author: popcornmix

arch/arm/configs/bcm2709_defconfig

@@ -441,6 +441,10 @@ CONFIG_MTD_SPI_NOR=m
 CONFIG_MTD_UBI=m
 CONFIG_OF_CONFIGFS=y
 CONFIG_ZRAM=m
+CONFIG_ZRAM_BACKEND_LZ4=y
+CONFIG_ZRAM_BACKEND_ZSTD=y
+CONFIG_ZRAM_BACKEND_LZO=y
+CONFIG_ZRAM_DEF_COMP_ZSTD=y
 CONFIG_ZRAM_WRITEBACK=y
 CONFIG_ZRAM_MULTI_COMP=y
 CONFIG_BLK_DEV_LOOP=y

arch/arm/configs/bcm2711_defconfig

@@ -448,6 +448,10 @@ CONFIG_MTD_SPI_NOR=m
 CONFIG_MTD_UBI=m
 CONFIG_OF_CONFIGFS=y
 CONFIG_ZRAM=m
+CONFIG_ZRAM_BACKEND_LZ4=y
+CONFIG_ZRAM_BACKEND_ZSTD=y
+CONFIG_ZRAM_BACKEND_LZO=y
+CONFIG_ZRAM_DEF_COMP_ZSTD=y
 CONFIG_ZRAM_WRITEBACK=y
 CONFIG_ZRAM_MULTI_COMP=y
 CONFIG_BLK_DEV_LOOP=y

arch/arm/configs/bcmrpi_defconfig

@@ -435,6 +435,10 @@ CONFIG_MTD_SPI_NOR=m
 CONFIG_MTD_UBI=m
 CONFIG_OF_CONFIGFS=y
 CONFIG_ZRAM=m
+CONFIG_ZRAM_BACKEND_LZ4=y
+CONFIG_ZRAM_BACKEND_ZSTD=y
+CONFIG_ZRAM_BACKEND_LZO=y
+CONFIG_ZRAM_DEF_COMP_ZSTD=y
 CONFIG_ZRAM_WRITEBACK=y
 CONFIG_ZRAM_MULTI_COMP=y
 CONFIG_BLK_DEV_LOOP=y

arch/arm64/configs/bcm2711_defconfig

@@ -473,6 +473,10 @@ CONFIG_MTD_SPI_NOR=m
 CONFIG_MTD_UBI=m
 CONFIG_OF_CONFIGFS=y
 CONFIG_ZRAM=m
+CONFIG_ZRAM_BACKEND_LZ4=y
+CONFIG_ZRAM_BACKEND_ZSTD=y
+CONFIG_ZRAM_BACKEND_LZO=y
+CONFIG_ZRAM_DEF_COMP_ZSTD=y
 CONFIG_ZRAM_WRITEBACK=y
 CONFIG_ZRAM_MULTI_COMP=y
 CONFIG_BLK_DEV_LOOP=y

arch/arm64/configs/bcm2712_defconfig

@@ -476,6 +476,10 @@ CONFIG_MTD_SPI_NOR=m
 CONFIG_MTD_UBI=m
 CONFIG_OF_CONFIGFS=y
 CONFIG_ZRAM=m
+CONFIG_ZRAM_BACKEND_LZ4=y
+CONFIG_ZRAM_BACKEND_ZSTD=y
+CONFIG_ZRAM_BACKEND_LZO=y
+CONFIG_ZRAM_DEF_COMP_ZSTD=y
 CONFIG_ZRAM_WRITEBACK=y
 CONFIG_ZRAM_MULTI_COMP=y
 CONFIG_BLK_DEV_LOOP=y

arch/arm64/configs/bcmrpi3_defconfig

@@ -447,6 +447,10 @@ CONFIG_MTD_SPI_NAND=m
 CONFIG_MTD_UBI=m
 CONFIG_OF_CONFIGFS=y
 CONFIG_ZRAM=m
+CONFIG_ZRAM_BACKEND_LZ4=y
+CONFIG_ZRAM_BACKEND_ZSTD=y
+CONFIG_ZRAM_BACKEND_LZO=y
+CONFIG_ZRAM_DEF_COMP_ZSTD=y
 CONFIG_ZRAM_WRITEBACK=y
 CONFIG_ZRAM_MULTI_COMP=y
 CONFIG_BLK_DEV_LOOP=y