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author | Jiri Olsa <jolsa@kernel.org> | 2019-11-26 15:12:53 +0300 |
---|---|---|
committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-11-26 17:17:45 +0300 |
commit | 7b65e2034fde011d090d4ec472902b71129c6cbd (patch) | |
tree | 570e29c12a67d5af3c764f4ffcb196f23f7aa32e /tools/build/feature | |
parent | a5732681e0e6ea0c3024f9d23bcf99b9237189ee (diff) | |
download | linux-7b65e2034fde011d090d4ec472902b71129c6cbd.tar.xz |
perf tools: Allow to link with libbpf dynamicaly
Currently we support only static linking with kernel's libbpf
(tools/lib/bpf). This patch adds libbpf package detection and support to
link perf with it dynamically.
The libbpf package status is displayed with:
$ make VF=1
Auto-detecting system features:
...
... libbpf: [ on ]
It's not checked by default, because it's quite new. Once it's on most
distros we can switch it on.
For the same reason it's not added to the test-all check.
Perf does not need advanced version of libbpf, so we can check just for
the base bpf_object__open function.
Adding new compile variable to detect libbpf package and link bpf
dynamically:
$ make LIBBPF_DYNAMIC=1
...
LINK perf
$ ldd perf | grep bpf
libbpf.so.0 => /lib64/libbpf.so.0 (0x00007f46818bc000)
If libbpf is not installed, build stops with:
Makefile.config:486: *** Error: No libbpf devel library found,\
please install libbpf-devel. Stop.
Committer testing:
$ make LIBBPF_DYNAMIC=1 -C tools/perf O=/tmp/build/perf
make: Entering directory '/home/acme/git/perf/tools/perf'
BUILD: Doing 'make -j8' parallel build
Makefile.config:493: *** Error: No libbpf devel library found, please install libbpf-devel. Stop.
make[1]: *** [Makefile.perf:225: sub-make] Error 2
make: *** [Makefile:70: all] Error 2
make: Leaving directory '/home/acme/git/perf/tools/perf'
$
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Toke Høiland-Jørgensen <toke@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Andrii Nakryiko <andriin@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org
Link: http://lore.kernel.org/lkml/20191126121253.28253-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/build/feature')
-rw-r--r-- | tools/build/feature/Makefile | 4 | ||||
-rw-r--r-- | tools/build/feature/test-libbpf.c | 7 |
2 files changed, 11 insertions, 0 deletions
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile index 8499385365c0..f30a89046aa3 100644 --- a/tools/build/feature/Makefile +++ b/tools/build/feature/Makefile @@ -53,6 +53,7 @@ FILES= \ test-zlib.bin \ test-lzma.bin \ test-bpf.bin \ + test-libbpf.bin \ test-get_cpuid.bin \ test-sdt.bin \ test-cxx.bin \ @@ -270,6 +271,9 @@ $(OUTPUT)test-get_cpuid.bin: $(OUTPUT)test-bpf.bin: $(BUILD) +$(OUTPUT)test-libbpf.bin: + $(BUILD) -lbpf + $(OUTPUT)test-sdt.bin: $(BUILD) diff --git a/tools/build/feature/test-libbpf.c b/tools/build/feature/test-libbpf.c new file mode 100644 index 000000000000..a508756cf4cc --- /dev/null +++ b/tools/build/feature/test-libbpf.c @@ -0,0 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <bpf/libbpf.h> + +int main(void) +{ + return bpf_object__open("test") ? 0 : -1; +} |