linux-kernel - Re: [PATCH v4] perf: bpf: Fix build breakage due to libbpf

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Date:	Fri, 8 Jan 2016 09:56:43 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
	Jiri Olsa <jolsa@...nel.org>
CC:	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<sukadev@...ux.vnet.ibm.com>
Subject: Re: [PATCH v4] perf: bpf: Fix build breakage due to libbpf



On 2016/1/8 5:23, Arnaldo Carvalho de Melo wrote:
> Em Thu, Jan 07, 2016 at 05:39:57PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Thu, Jan 07, 2016 at 12:28:15PM +0530, Naveen N. Rao escreveu:
>>> Can you please push at least the initial 3 patches of this for v4.4?
>>> Wang Nan has posted v6 here:
>>> http://thread.gmane.org/gmane.linux.kernel/2110626
>   
>> So I tried it again today, from the v6, the latest patch with that
>> subject line in my inbox, and I get this, after applying the first three
>> patches:
>   
>> [acme@zoo linux]$ make -C tools clean > /dev/null
>> [acme@zoo linux]$ make -C tools/perf build-test
>> make: Entering directory '/home/git/linux/tools/perf'
>> Testing Makefile
>> tests/make:15: /scripts/Makefile.arch: No such file or directory
>> make[2]: *** No rule to make target '/scripts/Makefile.arch'.  Stop.
>> tests/make:5: recipe for target 'all' failed
>> make[1]: *** [all] Error 2
>> Makefile:81: recipe for target 'build-test' failed
>> make: *** [build-test] Error 2
>> make: Leaving directory '/home/git/linux/tools/perf'
>> [acme@zoo linux]$
>> Trying to figure this out...
> So, this doesn't seem to have been tessted, this part, specifically:
>
> diff --git a/tools/perf/tests/make b/tools/perf/tests/make
> index 8ea3dffc5065..cd9c3ce1a5c2 100644
> --- a/tools/perf/tests/make
> +++ b/tools/perf/tests/make
> @@ -12,7 +12,7 @@ endif
>   else
>   PERF := .
>   
> -include config/Makefile.arch
> +include $(srctree)/scripts/Makefile.arch
>   
>   # FIXME looks like x86 is the only arch running tests ;-)
>   # we need some IS_(32/64) flag to make this generic
>
>
> ----------------------------------------------------
>
> Because $(srctree) is not set at that point, I copied the needed bits from
> tools/perf/Makefile.perf and got the patch below, which makes:L
>
>    make -C tools/perf build-test
>
> Work for me again.
>
> This should wrap up the day nicely, making me think of Jens Axboe recent
> cool reaction to an untested patch:
>
> http://lkml.kernel.org/r/5661C2BC.9030007@kernel.dk
>
> :-)
>

Sorry. I though I have tested my patch by building perf, but didn't
realize perf/tests/make is not used in normal building. Doing build-test
takes too long, so I always forget it. Also, in my environment it can fail:

   LD 
/opt/wangnan/yocto_build/tmp-eglibc/work/generic_x86_64-oe-linux/perf/1.0-r8/perf-1.0/perf-in.o
   LINK 
/opt/wangnan/yocto_build/tmp-eglibc/work/generic_x86_64-oe-linux/perf/1.0-r8/perf-1.0/perf
   test: test -x ./perf
make[2]: *** [make_no_newt] Error 1
make[1]: *** [all] Error 2
make: *** [build-test] Error 2

since I'm in a yocto building environment. I'll look into this problem 
and give a patch on it.

Thank you.