write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/usr/Kconfig
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@@ -18,7 +18,7 @@
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 	  When multiple directories and files are specified then the
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 	  initramfs image will be the aggregate of all of them.
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-	  See <file:Documentation/early-userspace/README> for more details.
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+	  See <file:Documentation/driver-api/early-userspace/early_userspace_support.rst> for more details.
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 	  If you are not sure, leave it blank.
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@@ -54,7 +54,6 @@
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 config RD_GZIP
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 	bool "Support initial ramdisk/ramfs compressed using gzip"
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-	depends on BLK_DEV_INITRD
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 	default y
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 	select DECOMPRESS_GZIP
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 	help
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@@ -64,7 +63,6 @@
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 config RD_BZIP2
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 	bool "Support initial ramdisk/ramfs compressed using bzip2"
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 	default y
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-	depends on BLK_DEV_INITRD
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 	select DECOMPRESS_BZIP2
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 	help
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 	  Support loading of a bzip2 encoded initial ramdisk or cpio buffer
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@@ -73,7 +71,6 @@
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 config RD_LZMA
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 	bool "Support initial ramdisk/ramfs compressed using LZMA"
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 	default y
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-	depends on BLK_DEV_INITRD
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 	select DECOMPRESS_LZMA
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 	help
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 	  Support loading of a LZMA encoded initial ramdisk or cpio buffer
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@@ -81,7 +78,6 @@
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 config RD_XZ
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 	bool "Support initial ramdisk/ramfs compressed using XZ"
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-	depends on BLK_DEV_INITRD
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 	default y
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 	select DECOMPRESS_XZ
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 	help
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@@ -91,7 +87,6 @@
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 config RD_LZO
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 	bool "Support initial ramdisk/ramfs compressed using LZO"
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 	default y
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-	depends on BLK_DEV_INITRD
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 	select DECOMPRESS_LZO
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 	help
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 	  Support loading of a LZO encoded initial ramdisk or cpio buffer
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@@ -100,16 +95,23 @@
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 config RD_LZ4
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 	bool "Support initial ramdisk/ramfs compressed using LZ4"
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 	default y
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-	depends on BLK_DEV_INITRD
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 	select DECOMPRESS_LZ4
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 	help
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 	  Support loading of a LZ4 encoded initial ramdisk or cpio buffer
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 	  If unsure, say N.
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+config RD_ZSTD
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+	bool "Support initial ramdisk/ramfs compressed using ZSTD"
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+	default y
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+	depends on BLK_DEV_INITRD
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+	select DECOMPRESS_ZSTD
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+	help
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+	  Support loading of a ZSTD encoded initial ramdisk or cpio buffer.
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+	  If unsure, say N.
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+
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 choice
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 	prompt "Built-in initramfs compression mode"
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-	depends on INITRAMFS_SOURCE!=""
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-	optional
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+	depends on INITRAMFS_SOURCE != ""
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 	help
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 	  This option allows you to decide by which algorithm the builtin
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 	  initramfs will be compressed.  Several compression algorithms are
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@@ -203,6 +205,17 @@
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 	  If you choose this, keep in mind that most distros don't provide lz4
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 	  by default which could cause a build failure.
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+config INITRAMFS_COMPRESSION_ZSTD
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+	bool "ZSTD"
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+	depends on RD_ZSTD
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+	help
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+	  ZSTD is a compression algorithm targeting intermediate compression
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+	  with fast decompression speed. It will compress better than GZIP and
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+	  decompress around the same speed as LZO, but slower than LZ4.
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+
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+	  If you choose this, keep in mind that you may need to install the zstd
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+	  tool to be able to compress the initram.
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+
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 config INITRAMFS_COMPRESSION_NONE
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 	bool "None"
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 	help
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@@ -215,21 +228,3 @@
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 	  filesystem image will be present in memory simultaneously
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 endchoice
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-
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-config INITRAMFS_COMPRESSION
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-	depends on INITRAMFS_SOURCE!=""
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-	string
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-	default ""      if INITRAMFS_COMPRESSION_NONE
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-	default ".gz"   if INITRAMFS_COMPRESSION_GZIP
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-	default ".bz2"  if INITRAMFS_COMPRESSION_BZIP2
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-	default ".lzma" if INITRAMFS_COMPRESSION_LZMA
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-	default ".xz"   if INITRAMFS_COMPRESSION_XZ
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-	default ".lzo"  if INITRAMFS_COMPRESSION_LZO
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-	default ".lz4"  if INITRAMFS_COMPRESSION_LZ4
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-	default ".gz"   if RD_GZIP
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-	default ".lz4"  if RD_LZ4
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-	default ".lzo"  if RD_LZO
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-	default ".xz"   if RD_XZ
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-	default ".lzma" if RD_LZMA
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-	default ".bz2"  if RD_BZIP2
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-	default ""