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    Subject[RFC PATCH v2 4/4] x86: Add support for LZ4-compressed kernel
    Date
    This patch integrates the LZ4 decompression code to the x86 pre-boot code.
    And it depends on two patchs below

    lib: Add support for LZ4-compressed kernel
    decompressor: Add LZ4 decompressor module

    Signed-off-by: Kyungsik Lee <kyungsik.lee@lge.com>
    ---
    arch/x86/Kconfig | 1 +
    arch/x86/boot/compressed/Makefile | 5 ++++-
    arch/x86/boot/compressed/misc.c | 4 ++++
    3 files changed, 9 insertions(+), 1 deletion(-)

    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index 225543b..ab916fd 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -63,6 +63,7 @@ config X86
    select HAVE_KERNEL_LZMA
    select HAVE_KERNEL_XZ
    select HAVE_KERNEL_LZO
    + select HAVE_KERNEL_LZ4
    select HAVE_HW_BREAKPOINT
    select HAVE_MIXED_BREAKPOINTS_REGS
    select PERF_EVENTS
    diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
    index 8a84501..c275db5 100644
    --- a/arch/x86/boot/compressed/Makefile
    +++ b/arch/x86/boot/compressed/Makefile
    @@ -4,7 +4,7 @@
    # create a compressed vmlinux image from the original vmlinux
    #

    -targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma vmlinux.bin.xz vmlinux.bin.lzo head_$(BITS).o misc.o string.o cmdline.o early_serial_console.o piggy.o
    +targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 head_$(BITS).o misc.o string.o cmdline.o early_serial_console.o piggy.o

    KBUILD_CFLAGS := -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2
    KBUILD_CFLAGS += -fno-strict-aliasing -fPIC
    @@ -64,12 +64,15 @@ $(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE
    $(call if_changed,xzkern)
    $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE
    $(call if_changed,lzo)
    +$(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE
    + $(call if_changed,lz4)

    suffix-$(CONFIG_KERNEL_GZIP) := gz
    suffix-$(CONFIG_KERNEL_BZIP2) := bz2
    suffix-$(CONFIG_KERNEL_LZMA) := lzma
    suffix-$(CONFIG_KERNEL_XZ) := xz
    suffix-$(CONFIG_KERNEL_LZO) := lzo
    +suffix-$(CONFIG_KERNEL_LZ4) := lz4

    quiet_cmd_mkpiggy = MKPIGGY $@
    cmd_mkpiggy = $(obj)/mkpiggy $< > $@ || ( rm -f $@ ; false )
    diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
    index 88f7ff6..166a0a8 100644
    --- a/arch/x86/boot/compressed/misc.c
    +++ b/arch/x86/boot/compressed/misc.c
    @@ -145,6 +145,10 @@ static int lines, cols;
    #include "../../../../lib/decompress_unlzo.c"
    #endif

    +#ifdef CONFIG_KERNEL_LZ4
    +#include "../../../../lib/decompress_unlz4.c"
    +#endif
    +
    static void scroll(void)
    {
    int i;
    --
    1.8.1.1


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