Re: [PATCH] kbuild: fix scripts/ to see the correct Kbuild path

From: Masahiro Yamada
Date: Wed Dec 10 2014 - 20:41:34 EST

Hi Paul,

On Mon, 08 Dec 2014 22:58:33 +0100
Paul Bolle <pebolle@xxxxxxxxxx> wrote:

> Masahiro,
> On Wed, 2014-12-03 at 15:52 +0900, Masahiro Yamada wrote:
> > The exported headers were moved to "uapi" directories.
> > We should check the existence of arch/*/include/uapi/asm/Kbuild.
> >
> > Signed-off-by: Masahiro Yamada <yamada.m@xxxxxxxxxxxxxxxx>
> > ---
> Does this patch fix any problems? If so, which?

I am fixing a wrong code.

Actually, the "um" architecture does not support headers install.

arch/um/include/asm/Kbuild exists
arch/um/include/uapi/asm/Kbuild does not exist

Checking arch/*/include/asm/Kbuild does not work.

Moreover, the top Makefile is checking arch/*/include/uapi/asm/Kbuild

headers_install: __headers
$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
$(error Headers not exportable for the $(SRCARCH) architecture))

> And why did no one
> notice these problems before? Perhaps the commit explanation could
> mention that.

You will notice the code below:

for arch in ${archs}; do
case ${arch} in
um) # no userspace export

"um" has already been omitted and it never reaches do_command().
That is why nobody has noticed this issue.

Uh, OK, we do not need double-checking.

Best Regards
Masahiro Yamada

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