linux-kernel - Re: [PATCH 3/3] kbuild: check the presence of lzo and lz4 tools when necessary

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Date:   Wed, 17 Oct 2018 17:59:02 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Borislav Petkov <bp@...e.de>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Bernd Edlinger <bernd.edlinger@...mail.de>,
        Sam Ravnborg <sam@...nborg.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] kbuild: check the presence of lzo and lz4 tools when necessary

On Wed, Oct 17, 2018 at 4:56 AM Borislav Petkov <bp@...e.de> wrote:
>
> On Tue, Oct 16, 2018 at 06:10:53PM +0900, Masahiro Yamada wrote:
> > If CONFIG_KERNEL_LZ4 is enabled without lz4 tool installed on the
> > system, the build fails at the very last stage (reported by
> > Borislav Petkov [1]).
> >
> >   LZO     arch/x86/boot/compressed/vmlinux.bin.lzo
> > /bin/sh: 1: lzop: not found
> > arch/x86/boot/compressed/Makefile:141: recipe for target 'arch/x86/boot/compressed/vmlinux.bin.lzo' failed
> > make[2]: *** [arch/x86/boot/compressed/vmlinux.bin.lzo] Error 1
> > arch/x86/boot/Makefile:112: recipe for target 'arch/x86/boot/compressed/vmlinux' failed
> > make[1]: *** [arch/x86/boot/compressed/vmlinux] Error 2
> > arch/x86/Makefile:284: recipe for target 'bzImage' failed
> > make: *** [bzImage] Error 2
> >
> > Check the tools in scripts/Makefile.toolcheck to fail the build
> > earlier with a more readable message.
> >
> > [1] https://patchwork.kernel.org/patch/10635381/
> >
> > Suggested-by: Borislav Petkov <bp@...e.de>
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> > ---
> >
> >  scripts/Makefile.toolcheck | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/scripts/Makefile.toolcheck b/scripts/Makefile.toolcheck
> > index bc26fc0..5e336e4 100644
> > --- a/scripts/Makefile.toolcheck
> > +++ b/scripts/Makefile.toolcheck
> > @@ -17,6 +17,14 @@ msg_stack_validation = "libelf is necessary for building the objtool." \
> >                      "Please install libelf-dev, libelf-devel or elfutils-libelf-devel."
> >  toolcheck-$(CONFIG_STACK_VALIDATION) += stack_validation
> >
> > +chk_lzo = command -v lzop
> > +msg_lzo = "lzo tool not found. Please install it."
> > +toolcheck-$(CONFIG_KERNEL_LZO) += lzo
> > +
> > +chk_lz4 = command -v lz4c
> > +msg_lz4 = "lz4 tool not found. Please install it."
> > +toolcheck-$(CONFIG_KERNEL_LZ4) += lz4
> > +
> >  PHONY += $(toolcheck-y)
> >  __toolcheck: $(toolcheck-y)
> >
> > --
>
> Cool, thanks for doing that!
>
> However, I applied all three, cleaned up the tree properly:
>
> $ git clean -dqfx
>
> and then used my .config (attached) which selects CONFIG_KERNEL_LZ4.
>
> And I built it twice just to make sure I'm seeing correctly but the
> error still happens at the end:
>
>   DESCEND  objtool
>   CALL    scripts/checksyscalls.sh
>   CHK     include/generated/compile.h
>   Building modules, stage 2.
>   CC      arch/x86/boot/compressed/misc.o
>   LZ4     arch/x86/boot/compressed/vmlinux.bin.lz4
> /bin/sh: 1: lz4c: not found
> make[2]: *** [arch/x86/boot/compressed/Makefile:143: arch/x86/boot/compressed/vmlinux.bin.lz4] Error 1
> make[2]: *** Waiting for unfinished jobs....
> make[1]: *** [arch/x86/boot/Makefile:112: arch/x86/boot/compressed/vmlinux] Error 2
> make: *** [arch/x86/Makefile:290: bzImage] Error 2
> make: *** Waiting for unfinished jobs....
>   MODPOST 956 modules
>
> What am I missing?


I have no idea.

With liblz4-tool package installed on my machine,
I can build x86 kernel with CONFIG_KERNEL_LZ4.




-- 
Best Regards
Masahiro Yamada