config XZ_DEC tristate "XZ decompression support" select CRC32 help LZMA2 compression algorithm and BCJ filters are supported using the .xz file format as the container. For integrity checking, CRC32 is supported. See Documentation/xz.txt for more information. if XZ_DEC config XZ_DEC_X86 bool "x86 BCJ filter decoder" if EXPERT default y select XZ_DEC_BCJ config XZ_DEC_POWERPC bool "PowerPC BCJ filter decoder" if EXPERT default y select XZ_DEC_BCJ config XZ_DEC_IA64 bool "IA-64 BCJ filter decoder" if EXPERT default y select XZ_DEC_BCJ config XZ_DEC_ARM bool "ARM BCJ filter decoder" if EXPERT default y select XZ_DEC_BCJ config XZ_DEC_ARMTHUMB bool "ARM-Thumb BCJ filter decoder" if EXPERT default y select XZ_DEC_BCJ config XZ_DEC_SPARC bool "SPARC BCJ filter decoder" if EXPERT default y select XZ_DEC_BCJ endif config XZ_DEC_BCJ bool default n config XZ_DEC_TEST tristate "XZ decompressor tester" default n depends on XZ_DEC help This allows passing .xz files to the in-kernel XZ decoder via a character special file. It calculates CRC32 of the decompressed data and writes diagnostics to the system log. Unless you are developing the XZ decoder, you don't need this and should say N.