linux-kernel - [PATCH 12/17] Kconfig: Remove support for LZMA-compressed initrd

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Date:   Fri,  9 Nov 2018 20:02:59 +0100
From:   Adam Borowski <kilobyte@...band.pl>
To:     linux-kernel@...r.kernel.org, Nick Terrell <terrelln@...com>,
        Russell King <linux@...linux.org.uk>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...ts.linux-m68k.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>, linux-mips@...ux-mips.org,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>,
        openrisc@...ts.librecores.org,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-s390@...r.kernel.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        linux-xtensa@...ux-xtensa.org
Cc:     Adam Borowski <kilobyte@...band.pl>
Subject: [PATCH 12/17] Kconfig: Remove support for LZMA-compressed initrd

Obsoleted by XZ.

The config option for compressing the kernel stays, as some archs have a
bootloader outside the kernel that wants LZMA.

Signed-off-by: Adam Borowski <kilobyte@...band.pl>
---
 Makefile    |  1 -
 usr/Kconfig | 28 ++--------------------------
 2 files changed, 2 insertions(+), 27 deletions(-)

diff --git a/Makefile b/Makefile
index c812467bfe11..97e4bf26a6d3 100644
--- a/Makefile
+++ b/Makefile
@@ -938,7 +938,6 @@ export mod_compress_cmd
 # This shall be used by the dracut(8) tool while creating an initramfs image.
 #
 INITRD_COMPRESS-y                  := gzip
-INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
diff --git a/usr/Kconfig b/usr/Kconfig
index 05b6be569041..8d99edacabc9 100644
--- a/usr/Kconfig
+++ b/usr/Kconfig
@@ -61,15 +61,6 @@ config RD_GZIP
 	  Support loading of a gzip encoded initial ramdisk or cpio buffer.
 	  If unsure, say Y.
 
-config RD_LZMA
-	bool "Support initial ramdisk/ramfs compressed using LZMA"
-	default y
-	depends on BLK_DEV_INITRD
-	select DECOMPRESS_LZMA
-	help
-	  Support loading of a LZMA encoded initial ramdisk or cpio buffer
-	  If unsure, say N.
-
 config RD_XZ
 	bool "Support initial ramdisk/ramfs compressed using XZ"
 	depends on BLK_DEV_INITRD
@@ -118,8 +109,8 @@ choice
 	  when building a kernel.  Decompression speed is relevant at
 	  each boot. Also the memory usage during decompression may become
 	  relevant on memory constrained systems. This is usually based on the
-	  dictionary size of the algorithm with algorithms like XZ and LZMA
-	  featuring large dictionary sizes.
+	  dictionary size of the algorithm with algorithms like XZ featuring
+	  large dictionary sizes.
 
 	  High compression options are mostly useful for users who are
 	  low on RAM, since it reduces the memory consumption during
@@ -152,19 +143,6 @@ config INITRAMFS_COMPRESSION_GZIP
 	  supported by your build system as the gzip tool is present by default
 	  on most distros.
 
-config INITRAMFS_COMPRESSION_LZMA
-	bool "LZMA"
-	depends on RD_LZMA
-	help
-	  This algorithm's compression ratio is best but has a large dictionary
-	  size which might cause issues in memory constrained systems.
-	  Decompression speed is between the other choices. Compression is
-	  slowest. The initramfs size is about 33% smaller with LZMA in
-	  comparison to gzip.
-
-	  If you choose this, keep in mind that you may need to install the xz
-	  or lzma tools to be able to compress the initram.
-
 config INITRAMFS_COMPRESSION_XZ
 	bool "XZ"
 	depends on RD_XZ
@@ -219,7 +197,6 @@ config INITRAMFS_COMPRESSION
 	string
 	default ""      if INITRAMFS_COMPRESSION_NONE
 	default ".gz"   if INITRAMFS_COMPRESSION_GZIP
-	default ".lzma" if INITRAMFS_COMPRESSION_LZMA
 	default ".xz"   if INITRAMFS_COMPRESSION_XZ
 	default ".lzo"  if INITRAMFS_COMPRESSION_LZO
 	default ".lz4"  if INITRAMFS_COMPRESSION_LZ4
@@ -228,6 +205,5 @@ config INITRAMFS_COMPRESSION
 	default ".lz4"  if RD_LZ4
 	default ".lzo"  if RD_LZO
 	default ".xz"   if RD_XZ
-	default ".lzma" if RD_LZMA
 	default ".zst"  if RD_ZSTD
 	default ""
-- 
2.19.1