linux-kernel - Re: [PATCH] x86, build: Improve the isolinux searching of isoimage generation

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Date:   Tue, 31 Oct 2017 10:39:38 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     changbin.du@...el.com,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <mmarek@...e.com>
Cc:     hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]  x86, build: Improve the isolinux searching of isoimage
 generation


* changbin.du@...el.com <changbin.du@...el.com> wrote:

> From: Changbin Du <changbin.du@...el.com>
> 
> Recently I failed to build isoimage target, because the path of isolinux.bin
> changed to /usr/xxx/ISOLINUX/isolinux.bin, as well as ldlinux.c32 which
> changed to /usr/xxx/syslinux/modules/bios/ldlinux.c32.
> 
> This patch has a improvement of the file search:
>   - Don't print the raw shell commands. It doesn't make sense to show the
>     entire big block.
>   - Show a error message instead of silent fail.
>   - Add above new paths.
> 
> Now it becomes:
> Kernel: arch/x86/boot/bzImage is ready  (#62)
> rm -rf arch/x86/boot/isoimage
> mkdir arch/x86/boot/isoimage
> Using /usr/lib/ISOLINUX/isolinux.bin
> Using /usr/lib/syslinux/modules/bios/ldlinux.c32
> cp arch/x86/boot/bzImage arch/x86/boot/isoimage/linux
> ...
> 
> Before:
> Kernel: arch/x86/boot/bzImage is ready  (#63)
> rm -rf arch/x86/boot/isoimage
> mkdir arch/x86/boot/isoimage
> for i in lib lib64 share end ; do \
> 	if [ -f /usr/$i/syslinux/isolinux.bin ] ; then \
> 		cp /usr/$i/syslinux/isolinux.bin arch/x86/boot/isoimage ; \
> 		if [ -f /usr/$i/syslinux/ldlinux.c32 ]; then \
> 			cp /usr/$i/syslinux/ldlinux.c32 arch/x86/boot/isoimage ; \
> 		fi ; \
> 		break ; \
> 	fi ; \
> 	if [ $i = end ] ; then exit 1 ; fi ; \
> done
> arch/x86/boot/Makefile:161: recipe for target 'isoimage' failed
> make[1]: *** [isoimage] Error 1

I like these changes. Could we please further improve it: for example the boot 
image build messages are still pretty unstructured, while regular build system 
messages come in the following format:

  CC      arch/x86/events/msr.o
  RELOCS  arch/x86/realmode/rm/realmode.relocs
  OBJCOPY arch/x86/realmode/rm/realmode.bin
  CC      arch/x86/kernel/signal.o
  AS      arch/x86/realmode/rmpiggy.o
  CC      ipc/msg.o
  AR      arch/x86/ia32/built-in.o
  CC      arch/x86/events/amd/iommu.o
  CC      init/do_mounts.o
  AR      arch/x86/realmode/built-in.o

So instead of:

> Kernel: arch/x86/boot/bzImage is ready  (#62)
> rm -rf arch/x86/boot/isoimage
> mkdir arch/x86/boot/isoimage
> Using /usr/lib/ISOLINUX/isolinux.bin
> Using /usr/lib/syslinux/modules/bios/ldlinux.c32
> cp arch/x86/boot/bzImage arch/x86/boot/isoimage/linux

Could we make it something more streamlined and similar to the rest of the build 
as well, like:

  GEN     arch/x86/boot/bzImage
  GEN     arch/x86/boot/isoimage
  GEN     arch/x86/boot/isoimage/linux

I.e. only mention the new files built, with an appropriate prefix.

I've Cc:-ed the kbuild maintainers, maybe they have a better suggestion instead of 
the 'GEN' abbreviation?

Thanks,

	Ingo