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

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Message-ID: <567416BC.7040901@bmw-carit.de>
Date:	Fri, 18 Dec 2015 15:22:52 +0100
From:	Daniel Wagner <daniel.wagner@...-carit.de>
To:	pi3orama <pi3orama@....com>
CC:	"Wangnan (F)" <wangnan0@...wei.com>, <ast@...nel.org>,
	<agartrell@...com>, <acme@...hat.com>, <bblanco@...mgrid.com>,
	<daniel@...earbox.net>, <davem@...emloft.net>, <mingo@...nel.org>,
	<jolsa@...nel.org>, <xiakaixu@...wei.com>,
	<holzheu@...ux.vnet.ibm.com>, <yang.shi@...aro.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF
 operations

On 12/18/2015 02:50 PM, pi3orama wrote:
>> Could it be that $(srcdir) somehow is not correct? I exchanged
>>
>>    feature_dir := $(srctree)/tools/build/feature
>> to
>>    feature_dir := /home/wagi/src/linux/tools/build/feature
>>
> 
> Can you remember the patch set I skipped?
> 
> http://lkml.kernel.org/g/1450316632-152513-4-git-send-email-wangnan0@huawei.com
> <http://lkml.kernel.org/g/1450316632-152513-1-git-send-email-wangnan0@huawei.com>

I'll give them a try next week.

> I thought that patch set is independent with this one but I was wrong.
> The reason
> of your problem is the missing of srctree. Could you please add the
> definition of
> srctree and try again? Like this:
> 
> +ifeq ($(srctree),)
> +srctree := $(patsubst %/,%,$(dir $(shell pwd)))
> +srctree := $(patsubst %/,%,$(dir $(srctree)))
> +srctree := $(patsubst %/,%,$(dir $(srctree)))
> +#$(info Determined 'srctree' to be $(srctree))
> +endif
> 
> At the head of tools/lib/bpf/Makefile

I tried that one but it didn't change unfortunately. I saw that code
snipped is already in tools/lib/bpf/Makefile line 62. It exists since

1b76c13e4b36 ("bpf tools: Introduce 'bpf' library and add bpf feature
check")

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