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

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Date:   Mon, 11 Dec 2017 10:56:40 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Richard Weinberger <richard@...ma-star.at>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        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 10:49 AM, Richard Weinberger wrote:
> Am Montag, 11. Dezember 2017, 11:19:54 CET schrieb Daniel Borkmann:
>> 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?
>>
>> 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
>>
>>  arch/um/include/asm/bpf_perf_event.h | 1 +
>>  include/asm-generic/bpf_perf_event.h | 1 +
>>  2 files changed, 2 insertions(+)
>>  create mode 100644 arch/um/include/asm/bpf_perf_event.h
>>  create mode 100644 include/asm-generic/bpf_perf_event.h
>>
>> diff --git a/arch/um/include/asm/bpf_perf_event.h
>> b/arch/um/include/asm/bpf_perf_event.h new file mode 100644
>> index 0000000..3097758
>> --- /dev/null
>> +++ b/arch/um/include/asm/bpf_perf_event.h
>> @@ -0,0 +1 @@
>> +#include <asm-generic/bpf_perf_event.h>
>> diff --git a/include/asm-generic/bpf_perf_event.h
>> b/include/asm-generic/bpf_perf_event.h new file mode 100644
>> index 0000000..67112e5
>> --- /dev/null
>> +++ b/include/asm-generic/bpf_perf_event.h
>> @@ -0,0 +1 @@
>> +#include <uapi/asm-generic/bpf_perf_event.h>
> 
> Hmm, what about this?
> 
> diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
> index 50a32c33d729..fb35ec000433 100644
> --- a/arch/um/include/asm/Kbuild
> +++ b/arch/um/include/asm/Kbuild
> @@ -27,3 +27,4 @@ generic-y += trace_clock.h
>  generic-y += word-at-a-time.h
>  generic-y += xor.h
>  generic-y += kprobes.h
> +generic-y += bpf_perf_event.h
> 

That also works for arch/um.

thanks,
-- 
~Randy