linux-kernel - Re: Linux 4.15-rc3 (uml + bpf_perf

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Message-ID: <1e0f5a3c-13f2-3d7d-821a-0bc45edc1df5@iogearbox.net>
Date:   Mon, 11 Dec 2017 18:32:23 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Richard Weinberger <richard@...ma-star.at>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        alexei.starovoitov@...il.com, brueckner@...ux.vnet.ibm.com
Subject: Re: Linux 4.15-rc3 (uml + bpf_perf_event.h)

On 12/11/2017 06:27 PM, Randy Dunlap wrote:
> On 12/11/2017 02:19 AM, Daniel Borkmann wrote:
>> Hi Randy, hi Richard, [ +Hendrik for c895f6f703ad7dd2f ]
>>
>> On 12/11/2017 09:32 AM, Richard Weinberger wrote:
>>> Randy,
>>>
>>> Am Montag, 11. Dezember 2017, 03:42:12 CET schrieb Randy Dunlap:
>>>> On 12/10/2017 06:08 PM, Linus Torvalds wrote:
>>>>> Another week, another rc.
>>>>
>>>> um (uml) won't build on i386 or x86_64:
>>>>
>>>>   CC      init/main.o
>>>> In file included from ../include/linux/perf_event.h:18:0,
>>>>                  from ../include/linux/trace_events.h:10,
>>>>                  from ../include/trace/syscall.h:7,
>>>>                  from ../include/linux/syscalls.h:82,
>>>>                  from ../init/main.c:20:
>>>> ../include/uapi/linux/bpf_perf_event.h:11:32: fatal error:
>>>> asm/bpf_perf_event.h: No such file or directory #include
>>>> <asm/bpf_perf_event.h>
>>>>                                 ^
>>>> compilation terminated.
>>>> ../scripts/Makefile.build:310: recipe for target 'init/main.o' failed
>>>
>>> How do you trigger that build failure?
>>> Can you share your .config?
> 
> Richard, it's just defconfig on both i386 and x86_64.
> 
>> Hmm, too bad kbuild bot doesn't catch issues on uml. I'm not too familiar
>> with uml, but looks like it's the only special case where there's no
>> arch/um/include/uapi/asm/. What is the usual convention to pull in such
>> headers in this case? Something like the below, would that fix it for you?
>>
>> Thanks for your help,
>> Daniel
> 
> Yes, that patch works.  Thanks.

Thanks, I'd get it out later today, and route it via bpf tree.