linux-kernel - Re: [PATCH v3 -next 4/5] x86: Add support for LZ4-compressed kernel

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Message-ID: <18eb6ca7-6993-40e9-a58d-116e1f6c37f6@email.android.com>
Date:	Tue, 05 Mar 2013 08:13:38 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kyungsik Lee <kyungsik.lee@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org, x86@...nel.org,
	celinux-dev@...ts.celinuxforum.org
CC:	Nicolas Pitre <nico@...xnic.net>, David Sterba <dsterba@...e.cz>,
	Nitin Gupta <nitingupta910@...il.com>,
	Joe Millenbach <jmillenbach@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michal Marek <mmarek@...e.cz>, hyojun.im@....com,
	chan.jeong@....com, raphael.andy.lee@...il.com
Subject: Re: [PATCH v3 -next 4/5] x86: Add support for LZ4-compressed kernel

Please add the new magic to Documentation/x86/boot.txt as well.

Kyungsik Lee <kyungsik.lee@....com> wrote:

>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@....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;

-- 
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