[PATCHv4 6/9] zram: Add recompression algorithm choice to Kconfig

From: Sergey Senozhatsky
Date: Tue Oct 18 2022 - 00:56:46 EST


Make (secondary) recompression algorithm selectable just like
we do it for the (primary) default one.

Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
---
drivers/block/zram/Kconfig | 40 +++++++++++++++++++++++++++++++++++
drivers/block/zram/zram_drv.c | 2 +-
2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig
index 3e00656a6f8a..076a76cd1664 100644
--- a/drivers/block/zram/Kconfig
+++ b/drivers/block/zram/Kconfig
@@ -93,3 +93,43 @@ config ZRAM_MULTI_COMP

SIZE (in bytes) parameter sets the object size watermark: idle
objects that are of a smaller size will not get recompressed.
+
+choice
+ prompt "Default zram recompression algorithm"
+ default ZRAM_DEF_RECOMP_ZSTD
+ depends on ZRAM && ZRAM_MULTI_COMP
+
+config ZRAM_DEF_RECOMP_LZORLE
+ bool "lzo-rle"
+ depends on CRYPTO_LZO
+
+config ZRAM_DEF_RECOMP_ZSTD
+ bool "zstd"
+ depends on CRYPTO_ZSTD
+
+config ZRAM_DEF_RECOMP_LZ4
+ bool "lz4"
+ depends on CRYPTO_LZ4
+
+config ZRAM_DEF_RECOMP_LZO
+ bool "lzo"
+ depends on CRYPTO_LZO
+
+config ZRAM_DEF_RECOMP_LZ4HC
+ bool "lz4hc"
+ depends on CRYPTO_LZ4HC
+
+config ZRAM_DEF_RECOMP_842
+ bool "842"
+ depends on CRYPTO_842
+
+endchoice
+
+config ZRAM_DEF_RECOMP
+ string
+ default "lzo-rle" if ZRAM_DEF_RECOMP_LZORLE
+ default "zstd" if ZRAM_DEF_RECOMP_ZSTD
+ default "lz4" if ZRAM_DEF_RECOMP_LZ4
+ default "lzo" if ZRAM_DEF_RECOMP_LZO
+ default "lz4hc" if ZRAM_DEF_RECOMP_LZ4HC
+ default "842" if ZRAM_DEF_RECOMP_842
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index da11560ecf70..1e9561217466 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -44,7 +44,7 @@ static int zram_major;
static const char *default_comp_algs[ZRAM_MAX_ZCOMPS] = {
CONFIG_ZRAM_DEF_COMP,
#ifdef CONFIG_ZRAM_MULTI_COMP
- "zstd",
+ CONFIG_ZRAM_DEF_RECOMP,
#endif
};

--
2.38.0.413.g74048e4d9e-goog