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Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF operations

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On 2015/12/18 16:49, Daniel Wagner wrote:
> On 12/18/2015 04:04 AM, Wangnan (F) wrote:
>> On 2015/12/17 21:46, Daniel Wagner wrote:
>>> On 12/17/2015 11:09 AM, Wangnan (F) wrote:
>>>> On 2015/12/17 16:29, Daniel Wagner wrote:
>>>>> On 12/17/2015 08:03 AM, Daniel Wagner wrote:
>>>>> Patch number 2 didn't apply cleanly.
>>>> When you see this, could you please have a look at:
>>>>
>>>> /home/wagi/src/linux/samples/bpf/libbpf/feature/test-*.make.output
>>>>
>>>> ?
>>> test-libpython.c:1:20: fatal error: Python.h: No such file or directory
>> So it is the content in test-all.make.output ? Then it is
>> not a problem. It is only a fastpath which tries to check
>> all features by one test. On most platform it would fail.
> I see.
>
>> BPF related feature check is not in test-all. It is a potential
>> bug, but I don't think it causes your problem.
>>
>> Another problem is you didn't see this in the first failure:
>>
>> Auto-detecting system features:
>> ...                        libelf: [ on  ]
>> ...                           bpf: [ on  ]
>>
>> This only happen when you already have a FEATURE-DUMP.libbpf in that
>> directory and it is same as the feature check result.
>>
>> Could you please remove samples/bpf in your building tree and
>> try again? After you see the failure, what's the content of
>>
>> /home/wagi/src/linux/samples/bpf/libbpf/FEATURE-* ?
> I cleanup up my tree (rm samples/bpf/ and git checkout samples/bpf) and then
>
> $ make samples/bpf/
>    CHK     include/config/kernel.release
>    CHK     include/generated/uapi/linux/version.h
>    CHK     include/generated/utsrelease.h
>    CHK     include/generated/bounds.h
>    CHK     include/generated/timeconst.h
>    CHK     include/generated/asm-offsets.h
>    CALL    scripts/checksyscalls.sh
>    LD      samples/bpf/built-in.o
> make -C /home/wagi/src/linux/tools/lib/bpf O=/home/wagi/src/linux/samples/bpf/libbpf CFLAGS= LDFLAGS= V=1 /home/wagi/src/linux/samples/bpf/libbpf/libbpf.a
>
> Auto-detecting system features:
> ...                        libelf: [ OFF ]
> ...                           bpf: [ OFF ]

That's good. This is not a magic. I guess something in your top makefile
causes this feature check failure. I sent a patch on feature checker to you.
It will appear as [1] soon. Could you please apply it and try again?

This time you will see test-*.make.output and test-*.make.makeoutput.
test-*.make.output lists your PATH, PWD and the gcc command you use for
feature check. test-*.make.makeoutput is the output of 'make' itself. I 
think
from these information we can find the root cause easier.

Thank you.

[1] 
http://lkml.kernel.org/g/1450436211-170447-1-git-send-email-wangnan0@huawei.com



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[PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF operations Wang Nan <wangnan0@huawei.com> - 2015-12-17 06:30 +0100
  [PATCH 01/10] bpf samples: bpf: Fix tracex5_kern.c compiling error Wang Nan <wangnan0@huawei.com> - 2015-12-17 06:30 +0100
  [PATCH 05/10] bpf tools: Support load different type of programs Wang Nan <wangnan0@huawei.com> - 2015-12-17 06:30 +0100
  [PATCH 03/10] bpf tools: Add const decoretor to 'license' and 'insns' for bpf_load_program() Wang Nan <wangnan0@huawei.com> - 2015-12-17 06:30 +0100
  [PATCH 02/10] bpf tools: Define LD and RM in Makefile for 'make -R' Wang Nan <wangnan0@huawei.com> - 2015-12-17 06:30 +0100
  [PATCH 06/10] bpf tools: Support new map operations Wang Nan <wangnan0@huawei.com> - 2015-12-17 06:30 +0100
    Re: [PATCH 06/10] bpf tools: Support new map operations "Wangnan (F)" <wangnan0@huawei.com> - 2015-12-17 07:10 +0100
    [PATCH v2 06/10] bpf tools: Support new map operations Wang Nan <wangnan0@huawei.com> - 2015-12-17 07:20 +0100
  [PATCH 07/10] bpf tools: Support BPF_OBJ_PIN and BPF_OBJ_GET Wang Nan <wangnan0@huawei.com> - 2015-12-17 06:30 +0100
  [PATCH 09/10] bpf samples: Uses libbpf in tools/lib to deal with BPF operations Wang Nan <wangnan0@huawei.com> - 2015-12-17 06:40 +0100
  Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations Daniel Wagner <daniel.wagner@bmw-carit.de> - 2015-12-17 07:40 +0100
    Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations "Wangnan (F)" <wangnan0@huawei.com> - 2015-12-17 08:00 +0100
      Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations Daniel Wagner <daniel.wagner@bmw-carit.de> - 2015-12-17 08:10 +0100
        Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations Daniel Wagner <daniel.wagner@bmw-carit.de> - 2015-12-17 09:30 +0100
          Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations "Wangnan (F)" <wangnan0@huawei.com> - 2015-12-17 11:20 +0100
            Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations Daniel Wagner <daniel.wagner@bmw-carit.de> - 2015-12-17 14:50 +0100
              Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations "Wangnan (F)" <wangnan0@huawei.com> - 2015-12-18 04:10 +0100
                Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations Daniel Wagner <daniel.wagner@bmw-carit.de> - 2015-12-18 10:00 +0100
                [PATCH] tools build: Output more data during feature detection Wang Nan <wangnan0@huawei.com> - 2015-12-18 12:00 +0100
                Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations "Wangnan (F)" <wangnan0@huawei.com> - 2015-12-18 12:10 +0100
                Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations Daniel Wagner <daniel.wagner@bmw-carit.de> - 2015-12-18 14:00 +0100
                Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF operations pi3orama <pi3orama@163.com> - 2015-12-18 15:20 +0100
                Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF  operations Daniel Wagner <daniel.wagner@bmw-carit.de> - 2015-12-18 15:30 +0100

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