linux-kernel - Re: [RFC PATCH v5 03/30] tools build: Add feature check for eBPF API

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Date:	Wed, 3 Jun 2015 09:15:48 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	<namhyung@...nel.org>, <alexei.starovoitov@...il.com>,
	<masami.hiramatsu.pt@...achi.com>, <paulus@...ba.org>,
	<a.p.zijlstra@...llo.nl>, <mingo@...hat.com>, <jolsa@...nel.org>,
	<dsahern@...il.com>, <daniel@...earbox.net>,
	<brendan.d.gregg@...il.com>, <lizefan@...wei.com>,
	<hekuang@...wei.com>, <xiakaixu@...wei.com>,
	<linux-kernel@...r.kernel.org>, <pi3orama@....com>
Subject: Re: [RFC PATCH v5 03/30] tools build: Add feature check for eBPF
 API



On 2015/6/3 6:11, Arnaldo Carvalho de Melo wrote:
> Em Mon, Jun 01, 2015 at 07:37:49AM +0000, Wang Nan escreveu:
>> In this patch, eBPF API is checked by compiling a c source file which
>> uses fields in bpf_attr which will be used by libbpf.
> Something is missing, where is the message saying that I need to install
> something to have bpf support? Look at the liblzma one at config/Makefile:556:
>
> [acme@zoo linux]$ rm -rf /tmp/build/perf ; mkdir -p /tmp/build/perf ; m
> make: Entering directory '/home/git/linux/tools/perf'
>    BUILD:   Doing 'make -j4' parallel build
>
> Auto-detecting system features:
> ...                         dwarf: [ OFF ]
> ...                         glibc: [ on  ]
> ...                          gtk2: [ on  ]
> ...                      libaudit: [ OFF ]
> ...                        libbfd: [ on  ]
> ...                        libelf: [ OFF ]
> ...                       libnuma: [ OFF ]
> ...                       libperl: [ on  ]
> ...                     libpython: [ OFF ]
> ...                      libslang: [ OFF ]
> ...                     libunwind: [ OFF ]
> ...            libdw-dwarf-unwind: [ OFF ]
> ...                          zlib: [ OFF ]
> ...                          lzma: [ OFF ]
> ...                           bpf: [ OFF ]
>
> config/Makefile:245: No libelf found, disables 'probe' tool, please install elfutils-libelf-devel/libelf-dev
> config/Makefile:325: Disabling post unwind, no support found.
> config/Makefile:366: No libaudit.h found, disables 'trace' tool, please install audit-libs-devel or libaudit-dev
> config/Makefile:381: slang not found, disables TUI support. Please install slang-devel or libslang-dev
> config/Makefile:466: No 'Python.h' (for Python 2.x support) was found: disables Python support - please install python-devel/python-dev
> config/Makefile:556: No liblzma found, disables xz kernel module decompression, please install xz-devel/liblzma-dev
> config/Makefile:569: No numa.h found, disables 'perf bench numa mem' benchmark, please install numactl-devel/libnuma-devel/libnuma-dev
>    MKDIR    /tmp/build/perf/util/
>    CC       /tmp/build/perf/util/abspath.o

Those messages are printed by perf's makefile. I'll add them in patch 
23/30 'perf tools: Make perf
depend on libbpf'. I think error message in this patch is not required, 
because other feature checks
are also silent when it found something is missing.

>
> Applied the first two patches in this series, will push them soon.

Do you want me to repost a full v6 series with those error messages 
added or only repost a v6 of 23/30
by replying the v5 patch?

Thank you.

>
> - Arnaldo


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