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

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Message-ID: <29f9908d-06e5-8e88-4433-9bd7935a0d1f@infradead.org>
Date:   Sat, 4 Aug 2018 08:47:20 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
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

On 08/03/2018 07:23 PM, Masahiro Yamada wrote:
> 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
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in
>> the body of a message to majordomo@...r.kernel.org
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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
> 
> 
> 

I tested this patch and it works.  :)
but then it's difficult to reproduce the problem.

Thanks!
-- 
~Randy