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A later commit updates lib/decompress_unxz.c to enable this filter for kernel decompression. lib/decompress_unxz.c is already used if CONFIG_EFI_ZBOOT=y && CONFIG_KERNEL_XZ=y. This filter can be used by Squashfs without modifications to the Squashfs kernel code (only needs support in userspace Squashfs-tools). Link: https://lkml.kernel.org/r/20240721133633.47721-13-lasse.collin@tukaani.org Signed-off-by: Lasse Collin <lasse.collin@tukaani.org> Reviewed-by: Sam James <sam@gentoo.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Emil Renner Berthing <emil.renner.berthing@canonical.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Joel Stanley <joel@jms.id.au> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Jubin Zhong <zhongjubin@huawei.com> Cc: Jules Maselbas <jmaselbas@zdiv.net> Cc: Krzysztof Kozlowski <krzk@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Rui Li <me@lirui.org> Cc: Simon Glass <sjg@chromium.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
78 lines
1.8 KiB
Plaintext
78 lines
1.8 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config XZ_DEC
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tristate "XZ decompression support"
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select CRC32
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help
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LZMA2 compression algorithm and BCJ filters are supported using
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the .xz file format as the container. For integrity checking,
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CRC32 is supported. See Documentation/staging/xz.rst for more
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information.
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if XZ_DEC
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config XZ_DEC_X86
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bool "x86 BCJ filter decoder" if EXPERT
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default y
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select XZ_DEC_BCJ
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config XZ_DEC_POWERPC
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bool "PowerPC BCJ filter decoder" if EXPERT
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default y
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select XZ_DEC_BCJ
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config XZ_DEC_ARM
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bool "ARM BCJ filter decoder" if EXPERT
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default y
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select XZ_DEC_BCJ
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config XZ_DEC_ARMTHUMB
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bool "ARM-Thumb BCJ filter decoder" if EXPERT
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default y
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select XZ_DEC_BCJ
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config XZ_DEC_ARM64
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bool "ARM64 BCJ filter decoder" if EXPERT
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default y
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select XZ_DEC_BCJ
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config XZ_DEC_SPARC
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bool "SPARC BCJ filter decoder" if EXPERT
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default y
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select XZ_DEC_BCJ
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config XZ_DEC_RISCV
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bool "RISC-V BCJ filter decoder" if EXPERT
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default y
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select XZ_DEC_BCJ
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config XZ_DEC_MICROLZMA
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bool "MicroLZMA decoder"
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default n
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help
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MicroLZMA is a header format variant where the first byte
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of a raw LZMA stream (without the end of stream marker) has
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been replaced with a bitwise-negation of the lc/lp/pb
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properties byte. MicroLZMA was created to be used in EROFS
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but can be used by other things too where wasting minimal
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amount of space for headers is important.
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Unless you know that you need this, say N.
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endif
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config XZ_DEC_BCJ
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bool
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default n
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config XZ_DEC_TEST
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tristate "XZ decompressor tester"
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default n
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depends on XZ_DEC
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help
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This allows passing .xz files to the in-kernel XZ decoder via
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a character special file. It calculates CRC32 of the decompressed
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data and writes diagnostics to the system log.
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Unless you are developing the XZ decoder, you don't need this
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and should say N.
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