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| author | Nick Terrell <terrelln@fb.com> | 2020-07-30 12:08:36 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-07-31 11:49:08 +0200 |
| commit | 48f7ddf785af24aa380f3282d8d4400883d0099e (patch) | |
| tree | 2966f60c6983ba2e09c0972da2c3cca51eecf140 /init | |
| parent | 4963bb2b89884bbdb7e33e6a09c159551e9627aa (diff) | |
| download | lwn-48f7ddf785af24aa380f3282d8d4400883d0099e.tar.gz lwn-48f7ddf785af24aa380f3282d8d4400883d0099e.zip | |
init: Add support for zstd compressed kernel
- Add the zstd and zstd22 cmds to scripts/Makefile.lib
- Add the HAVE_KERNEL_ZSTD and KERNEL_ZSTD options
Architecture specific support is still needed for decompression.
Signed-off-by: Nick Terrell <terrelln@fb.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20200730190841.2071656-4-nickrterrell@gmail.com
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/init/Kconfig b/init/Kconfig index 0498af567f70..2b6409fec53f 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -191,13 +191,16 @@ config HAVE_KERNEL_LZO config HAVE_KERNEL_LZ4 bool +config HAVE_KERNEL_ZSTD + bool + config HAVE_KERNEL_UNCOMPRESSED bool choice prompt "Kernel compression mode" default KERNEL_GZIP - depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4 || HAVE_KERNEL_UNCOMPRESSED + depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4 || HAVE_KERNEL_ZSTD || HAVE_KERNEL_UNCOMPRESSED help The linux kernel is a kind of self-extracting executable. Several compression algorithms are available, which differ @@ -276,6 +279,16 @@ config KERNEL_LZ4 is about 8% bigger than LZO. But the decompression speed is faster than LZO. +config KERNEL_ZSTD + bool "ZSTD" + depends on HAVE_KERNEL_ZSTD + help + ZSTD is a compression algorithm targeting intermediate compression + with fast decompression speed. It will compress better than GZIP and + decompress around the same speed as LZO, but slower than LZ4. You + will need at least 192 KB RAM or more for booting. The zstd command + line tool is required for compression. + config KERNEL_UNCOMPRESSED bool "None" depends on HAVE_KERNEL_UNCOMPRESSED |