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Date: Tue, 9 Jan 2024 14:24:07 +0100
From: Nicolas Schier <n.schier@....de>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org, Ben Hutchings <ben@...adent.org.uk>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	linux-kernel@...r.kernel.org, Nicolas Schier <nicolas@...sle.eu>
Subject: Re: [PATCH 1/5] kbuild: deb-pkg: move 'make headers' to build-arch

On Tue, Jan 09, 2024 at 01:38:07PM +0900, Masahiro Yamada wrote:
> On Sat, Dec 30, 2023 at 10:52 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >
> > Strictly speaking, 'make headers' should be a part of build-arch
> > instead of binary-arch.
> >
> > 'make headers' constructs read-to-copy UAPI headers in the kernel

s/read/ready/ ?

> > directory.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> >  scripts/package/builddeb     | 1 -
> >  scripts/package/debian/rules | 4 ++--
> >  2 files changed, 2 insertions(+), 3 deletions(-)
> >
> > diff --git a/scripts/package/builddeb b/scripts/package/builddeb
> > index cc8c7a807fcc..842ee4b40528 100755
> > --- a/scripts/package/builddeb
> > +++ b/scripts/package/builddeb
> > @@ -155,7 +155,6 @@ install_libc_headers () {
> >
> >         rm -rf $pdir
> >
> > -       $MAKE -f $srctree/Makefile headers
> >         $MAKE -f $srctree/Makefile headers_install INSTALL_HDR_PATH=$pdir/usr
> >
> >         # move asm headers to /usr/include/<libc-machine>/asm to match the structure
> > diff --git a/scripts/package/debian/rules b/scripts/package/debian/rules
> > index cb084e387469..a686c37d0d02 100755
> > --- a/scripts/package/debian/rules
> > +++ b/scripts/package/debian/rules
> > @@ -26,8 +26,8 @@ binary-arch: build-arch
> >  build: build-arch build-indep
> >  build-indep:
> >  build-arch:
> > -       $(MAKE) $(make-opts) \
> > -       olddefconfig all
> > +       $(MAKE) $(make-opts) olddefconfig
> > +       $(MAKE) $(make-opts) headers all
> 
> 
> 
> 
> To avoid a build error for ARCH=um,
> I will apply the following fix-up.
> 
> 
> 
> 
> 
> diff --git a/scripts/package/debian/rules b/scripts/package/debian/rules
> index 1a18ca3c43db..098307780062 100755
> --- a/scripts/package/debian/rules
> +++ b/scripts/package/debian/rules
> @@ -27,7 +27,7 @@ build: build-arch build-indep
>  build-indep:
>  build-arch:
>         $(MAKE) $(make-opts) olddefconfig
> -       $(MAKE) $(make-opts) headers all
> +       $(MAKE) $(make-opts) $(if $(filter um,$(ARCH)),,headers) all

Reviewed-by: Nicolas Schier <n.schier@....de>

I'm wondering if we might want to change the headers target in top-level
Makefile to not bail-out for ARCH=um but only show a warning that there
is nothing to export.

Kind regards,
Nicolas

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