linux-kernel - Re: [PATCH v2] kbuild: factor out the common installation code into scripts/install.sh

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Message-ID: <CAK7LNASDZz4osNX3HgzrK7KVQ0C4uEGOBjbmCfTsBG25jOieXA@mail.gmail.com>
Date:   Tue, 10 May 2022 21:56:45 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nicolas Schier <n.schier@....de>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] kbuild: factor out the common installation code into scripts/install.sh

On Tue, May 10, 2022 at 7:04 PM Nicolas Schier <n.schier@....de> wrote:
>
> On Tue,  3 May 2022 11:47 +0900 Masahiro Yamada wrote:
> > Many architectures have similar install.sh scripts.
> >
> > The first half is really generic; verifies that the kernel image and
> > System.map exist, then executes ~/bin/${INSTALLKERNEL} or
> > /sbin/${INSTALLKERNEL} if available.
> >
> > The second half is kind of arch-specific. It just copies the kernel image
> > and System.map to the destination, but the code is slightly different.
> >
> > This patch factors out the generic part into scripts/install.sh.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> > Changes in v2:
> >   - Move the installkernel parameters to scripts/install.sh
> >
> >  Makefile                     |  3 ++-
> >  arch/arm/Makefile            |  4 ++--
> >  arch/arm/boot/install.sh     | 21 ------------------
> >  arch/arm64/Makefile          |  6 ++----
> >  arch/arm64/boot/install.sh   | 21 ------------------
> >  arch/ia64/Makefile           |  3 ++-
> >  arch/ia64/install.sh         | 10 ---------
> >  arch/m68k/Makefile           |  3 ++-
> >  arch/m68k/install.sh         | 22 -------------------
> >  arch/nios2/Makefile          |  3 +--
> >  arch/nios2/boot/install.sh   | 22 -------------------
> >  arch/parisc/Makefile         | 11 +++++-----
> >  arch/parisc/install.sh       | 28 ------------------------
> >  arch/powerpc/Makefile        |  3 +--
> >  arch/powerpc/boot/install.sh | 23 --------------------
> >  arch/riscv/Makefile          |  7 +++---
> >  arch/riscv/boot/install.sh   | 21 ------------------
> >  arch/s390/Makefile           |  3 +--
> >  arch/s390/boot/install.sh    |  6 ------
> >  arch/sparc/Makefile          |  3 +--
> >  arch/sparc/boot/install.sh   | 22 -------------------
> >  arch/x86/Makefile            |  3 +--
> >  arch/x86/boot/install.sh     | 22 -------------------
> >  scripts/install.sh           | 41 ++++++++++++++++++++++++++++++++++++
> >  24 files changed, 64 insertions(+), 247 deletions(-)
> >  mode change 100644 => 100755 arch/arm/boot/install.sh
> >  mode change 100644 => 100755 arch/arm64/boot/install.sh
> >  mode change 100644 => 100755 arch/ia64/install.sh
> >  mode change 100644 => 100755 arch/m68k/install.sh
> >  mode change 100644 => 100755 arch/nios2/boot/install.sh
> >  mode change 100644 => 100755 arch/parisc/install.sh
> >  mode change 100644 => 100755 arch/powerpc/boot/install.sh
> >  mode change 100644 => 100755 arch/riscv/boot/install.sh
> >  mode change 100644 => 100755 arch/s390/boot/install.sh
> >  mode change 100644 => 100755 arch/sparc/boot/install.sh
> >  mode change 100644 => 100755 arch/x86/boot/install.sh
> >  create mode 100755 scripts/install.sh
> >
> > diff --git a/Makefile b/Makefile
> > index 9a60f732bb3c..154c32af8805 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -1298,7 +1298,8 @@ scripts_unifdef: scripts_basic
> >  # to this Makefile to build and install external modules.
> >  # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
> >
> > -install: sub_make_done :=
> > +quiet_cmd_install = INSTALL $(INSTALL_PATH)
> > +      cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
>
> This is the third 'cmd_install' in the tree; might it be better to take
> a more unique name (e.g. cmd_installkernel) to prevent confusion?

If this is confusing, we can rename the ones in
scripts/Makefile.{modinst,headersinst}.

This command name matches the build target ("make install"), so
I believe this name is good.



>
> For me, it would have been more clear, if we'd also move the default
> KBUILD_IMAGE definition here (similar to the corresponding part in
> arch/parisc/Makefile):
>
> zinstall: KBUILD_IMAGE := $(boot)/Image.gz
>
> ($(KBUILD_IMAGE) seems not to be used anywhere else in arch/arm64/
> tree; but I haven't checked in depth.)


KBUILD_IMAGE is _indirectly_ used to specify
the kernel image for package builds.    [1]

This target returns the value IMAGE_BUILD.   [2]


$(KBUILD_IMAGE) is definitely used for arm64.

[1]: https://github.com/torvalds/linux/blob/v5.17/scripts/package/builddeb#L150
[2]: https://github.com/torvalds/linux/blob/v5.17/Makefile#L1943







> > diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
> > index 7583fc39ab2d..aca1710fd658 100644
> > --- a/arch/parisc/Makefile
> > +++ b/arch/parisc/Makefile
> > @@ -184,12 +184,11 @@ vdso_install:
> >       $(Q)$(MAKE) $(build)=arch/parisc/kernel/vdso $@
> >       $(if $(CONFIG_COMPAT_VDSO), \
> >               $(Q)$(MAKE) $(build)=arch/parisc/kernel/vdso32 $@)
> > -install:
> > -     $(CONFIG_SHELL) $(srctree)/arch/parisc/install.sh \
> > -                     $(KERNELRELEASE) vmlinux System.map "$(INSTALL_PATH)"
> > -zinstall:
> > -     $(CONFIG_SHELL) $(srctree)/arch/parisc/install.sh \
> > -                     $(KERNELRELEASE) vmlinuz System.map "$(INSTALL_PATH)"
> > +
> > +install: KBUILD_IMAGE := vmlinux
> > +zinstall: KBUILD_IMAGE := vmlinuz
>
> Does this make the KBUILD_IMAGE definition in line 19 obsolete and
> unused?


As I said above for arm64, KBUILD_IMAGE is used for package builds.

If you delete line 19, it will change the behavior.
(fall back to the global default [3])


[3]: https://github.com/torvalds/linux/blob/v5.17/Makefile#L1059





> > diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> > index eb541e730d3c..45a9caa37b4e 100644
> > --- a/arch/powerpc/Makefile
> > +++ b/arch/powerpc/Makefile
> > @@ -408,8 +408,7 @@ endef
> >
> >  PHONY += install
> >  install:
>
> I can't find a KBUILD_IMAGE definition in arch/powerpc/Makefile.
> Should it be set here as a target-specific varibable, too?


Right, powerpc does not define KBUILD_IMAGE explicitly.
It falls back to [3].






-- 
Best Regards
Masahiro Yamada