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samples/bpf: allow make to be run from samples/bpf/ directory

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It is not intuitive that 'make' must be run from the top level
directory with argument "samples/bpf/" to compile these eBPF samples.

Introduce a kbuild make file trick that allow make to be run from the
"samples/bpf/" directory itself.  It basically change to the top level
directory and call "make samples/bpf/" with the "/" slash after the
directory name.

Also add a clean target that only cleans this directory, by taking
advantage of the kbuild external module setting M=$PWD.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer 2016-04-28 14:21:09 +02:00 committed by David S. Miller
parent 1c97566d51
commit b62a796c10
2 changed files with 11 additions and 0 deletions
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8
samples/bpf/Makefile
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@ -85,6 +85,14 @@ HOSTLOADLIBES_test_overhead += -lelf -lrt
# make samples/bpf/ LLC=~/git/llvm/build/bin/llc
LLC ?= llc
# Trick to allow make to be run from this directory
all:
$(MAKE) -C ../../ $$PWD/
clean:
$(MAKE) -C ../../ M=$$PWD clean
@rm -f *~
# Verify LLVM compiler is available and bpf target is supported
.PHONY: verify_cmd_llc verify_target_bpf

3
samples/bpf/README.rst
View File

@ -36,6 +36,9 @@ top level directory::
Do notice the "/" slash after the directory name.
It is also possible to call make from this directory. This will just
hide the the invocation of make as above with the appended "/".
Manually compiling LLVM with 'bpf' support
------------------------------------------