+ zram-add-recompression-algorithm-choice-to-kconfig.patch added to mm-unstable branch

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The patch titled
     Subject: zram: add recompression algorithm choice to Kconfig
has been added to the -mm mm-unstable branch.  Its filename is
     zram-add-recompression-algorithm-choice-to-kconfig.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zram-add-recompression-algorithm-choice-to-kconfig.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Subject: zram: add recompression algorithm choice to Kconfig
Date: Sun, 9 Oct 2022 18:07:18 +0900

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

Link: https://lkml.kernel.org/r/20221009090720.1040633-7-senozhatsky@xxxxxxxxxxxx
Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 drivers/block/zram/Kconfig    |   40 ++++++++++++++++++++++++++++++++
 drivers/block/zram/zram_drv.c |    2 -
 2 files changed, 41 insertions(+), 1 deletion(-)

--- a/drivers/block/zram/Kconfig~zram-add-recompression-algorithm-choice-to-kconfig
+++ a/drivers/block/zram/Kconfig
@@ -90,3 +90,43 @@ config ZRAM_MULTI_COMP
 
           echo TIMEOUT > /sys/block/zramX/idle
           echo SIZE > /sys/block/zramX/recompress
+
+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
--- a/drivers/block/zram/zram_drv.c~zram-add-recompression-algorithm-choice-to-kconfig
+++ a/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
 };
 
_

Patches currently in -mm which might be from senozhatsky@xxxxxxxxxxxx are

zram-preparation-for-multi-zcomp-support.patch
zram-add-recompression-algorithm-sysfs-knob.patch
zram-factor-out-wb-and-non-wb-zram-read-functions.patch
zram-introduce-recompress-sysfs-knob.patch
documentation-add-recompression-documentation.patch
zram-add-recompression-algorithm-choice-to-kconfig.patch
zram-add-recompress-flag-to-read_block_state.patch
zram-correct-typos.patch




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