linux-kernel - Re: kbuild: ARCH=um archheaders failed

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Date:   Sat, 4 Aug 2018 11:23:26 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kbuild <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Richard Weinberger <richard@....at>,
        linux-um@...ts.infradead.org
Subject: Re: kbuild: ARCH=um archheaders failed

2018-08-04 0:41 GMT+09:00 Randy Dunlap <rdunlap@...radead.org>:
> On 08/02/2018 05:13 PM, Randy Dunlap wrote:
>> Hi Yamada-san,
>>
>> I see this every few weeks.  It's not reproducible (it depends
>> on the moon, Mars, etc.).
>>
>> I'm using O=builddir.  The build log is short (below).
>>
>> Do you see a makefile problem here?  (nothing to do with mmotm;
>> I see it more frequently with linux-next since I do many daily
>> builds with it)
>
> BTW, this is just um defconfig with -j4.
>
> --
> ~Randy
> --
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I will send a patch with commit description later
after more testing,
but the following patch should fix the issue.


diff --git a/arch/um/Makefile b/arch/um/Makefile
index d3975e7..1cec053 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -120,7 +120,7 @@ archheaders:
        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
                    kbuild-file=$(HOST_DIR)/include/uapi/asm/Kbuild \
                    obj=$(HOST_DIR)/include/generated/uapi/asm
-       $(Q)$(MAKE) KBUILD_SRC= ARCH=$(HEADER_ARCH) archheaders
+       $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) archheaders


 archprepare: include/generated/user_constants.h



-- 
Best Regards
Masahiro Yamada