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From: Masahiro Yamada <yamada.masahiro@socionext.com>
Date: Tue, 18 Sep 2018 13:01:48 +0900
Message-ID: <CAK7LNASW+cKjoUGpTvBwf-4J38VhF0AMpNBX1Tny_2mguLBmaw@mail.gmail.com>
Subject: Re: [PATCH 1/3] um: fix parallel building with O= option
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To: Kees Cook <keescook@chromium.org>
Cc: Jeff Dike <jdike@addtoit.com>, Richard Weinberger <richard@nod.at>, linux-um@lists.infradead.org, Randy Dunlap <rdunlap@infradead.org>, Geert Uytterhoeven <geert@linux-m68k.org>, Michal Marek <michal.lkml@markovi.net>, Sam Ravnborg <sam@ravnborg.org>, LKML <linux-kernel@vger.kernel.org>
List-ID: <linux-um.lists.infradead.org>

Hi Kees,


2018-09-16 3:47 GMT+09:00 Kees Cook <keescook@chromium.org>:
> On Fri, Aug 3, 2018 at 9:47 PM, Masahiro Yamada
> <yamada.masahiro@socionext.com> wrote:
>> Randy Dunlap reports UML occasionally fails to build with -j<N> and
>> O=<builddir> options.
>
> With v4.19-rc2 I'm still seeing a failure (for any parallelism) under ARCH=um
>
> $ make -j8 ARCH=um O=/tmp/foo
> ...
> /home/kees/src/linux-build/um/Makefile:1185: *** Headers not
> exportable for the um architecture.  Stop.
>
> Am I missing something?


This is a different problem.

I sent a patch:
https://patchwork.kernel.org/patch/10603707/



-- 
Best Regards
Masahiro Yamada