netdev - Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf

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Date:   Thu, 15 Dec 2016 15:29:18 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Joe Stringer <joe@....org>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        wangnan0@...wei.com, ast@...com, daniel@...earbox.net,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf

Em Thu, Dec 15, 2016 at 12:50:22PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Dec 14, 2016 at 02:43:39PM -0800, Joe Stringer escreveu:
> > Now that libbpf under tools/lib/bpf/* is synced with the version from
> > samples/bpf, we can get rid most of the libbpf library here.
> > 
> > Signed-off-by: Joe Stringer <joe@....org>
> > Cc: Alexei Starovoitov <ast@...com>
> > Cc: Daniel Borkmann <daniel@...earbox.net>
> > Cc: Wang Nan <wangnan0@...wei.com>
> > Link: http://lkml.kernel.org/r/20161209024620.31660-6-joe@ovn.org
> > [ Use -I$(srctree)/tools/lib/ to support out of source code tree builds, as noticed by Wang Nan ]

So, the above comment no longer applied to this adjusted patch from you,
as you removed one hunk too much, that, after applied, gets samples/bpf/
to build successfully:

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index add514e2984a..81b0ef2f7994 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -107,6 +107,7 @@ always += lwt_len_hist_kern.o
 always += xdp_tx_iptunnel_kern.o
 
 HOSTCFLAGS += -I$(objtree)/usr/include
+HOSTCFLAGS += -I$(srctree)/tools/lib/
 HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
 
 HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable

---------------------

I added it, continuing...

- Arnaldo

> > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> So, right before this patch building samples/bpf works, then, after, it fails,
> investigating:
> 
> [root@...97fdfbf4f linux]# make -j4 O=/tmp/build/linux/ headers_install
> make[1]: Entering directory '/tmp/build/linux'
>   CHK     include/generated/uapi/linux/version.h
> make[1]: Leaving directory '/tmp/build/linux'
> [root@...97fdfbf4f linux]# make -j4 O=/tmp/build/linux/ samples/bpf/
> make[1]: Entering directory '/tmp/build/linux'
>   CHK     include/config/kernel.release
>   GEN     ./Makefile
>   CHK     include/generated/uapi/linux/version.h
>   Using /git/linux as source for kernel
>   CHK     include/generated/utsrelease.h
>   CHK     include/generated/timeconst.h
>   CHK     include/generated/bounds.h
>   CHK     include/generated/asm-offsets.h
>   CALL    /git/linux/scripts/checksyscalls.sh
>   HOSTCC  samples/bpf/test_lru_dist.o
>   HOSTCC  samples/bpf/libbpf.o
>   HOSTCC  samples/bpf/sock_example.o
>   HOSTCC  samples/bpf/bpf_load.o
> In file included from /git/linux/samples/bpf/libbpf.c:12:0:
> /git/linux/samples/bpf/libbpf.h:5:21: fatal error: bpf/bpf.h: No such file or directory
>  #include <bpf/bpf.h>
>                      ^
> compilation terminated.
> In file included from /git/linux/samples/bpf/test_lru_dist.c:24:0:
> /git/linux/samples/bpf/libbpf.h:5:21: fatal error: bpf/bpf.h: No such file or directory
>  #include <bpf/bpf.h>
>                      ^
> compilation terminated.
> make[2]: *** [scripts/Makefile.host:124: samples/bpf/test_lru_dist.o] Error 1
> make[2]: *** Waiting for unfinished jobs....
> make[2]: *** [scripts/Makefile.host:124: samples/bpf/libbpf.o] Error 1
> In file included from /git/linux/samples/bpf/bpf_load.c:24:0:
> /git/linux/samples/bpf/libbpf.h:5:21: fatal error: bpf/bpf.h: No such file or directory
>  #include <bpf/bpf.h>
>                      ^
> compilation terminated.
> make[2]: *** [scripts/Makefile.host:124: samples/bpf/bpf_load.o] Error 1
> In file included from /git/linux/samples/bpf/sock_example.c:29:0:
> /git/linux/samples/bpf/libbpf.h:5:21: fatal error: bpf/bpf.h: No such file or directory
>  #include <bpf/bpf.h>
>                      ^
> compilation terminated.
> make[2]: *** [scripts/Makefile.host:124: samples/bpf/sock_example.o] Error 1
> make[1]: *** [/git/linux/Makefile:1659: samples/bpf/] Error 2
> make[1]: Leaving directory '/tmp/build/linux'
> make: *** [Makefile:150: sub-make] Error 2
> [root@...97fdfbf4f linux]#