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SubjectRe: [PATCH bpf-next v2 09/10] selftests: Remove tools/lib/bpf from include path
On Wed, Jan 15, 2020 at 6:16 AM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> From: Toke Høiland-Jørgensen <toke@redhat.com>
>
> To make sure no new files are introduced that doesn't include the bpf/
> prefix in its #include, remove tools/lib/bpf from the include path
> entirely, and use tools/lib instead. To fix the original issue with
> bpf_helper_defs.h being stale, change the Makefile rule to regenerate the
> file in the lib/bpf dir instead of having a local copy in selftests.
>
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
> ---
> tools/testing/selftests/bpf/.gitignore | 3 ++-
> tools/testing/selftests/bpf/Makefile | 16 ++++++++--------
> 2 files changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
> index 1d14e3ab70be..17dd02651dee 100644
> --- a/tools/testing/selftests/bpf/.gitignore
> +++ b/tools/testing/selftests/bpf/.gitignore
> @@ -33,10 +33,11 @@ libbpf.pc
> libbpf.so.*
> test_hashmap
> test_btf_dump
> +test_cgroup_attach
> +test_select_reuseport

These were moved into test_progs, they are not independent binaries
anymore, you probably just had old leftovers lying in your
selftests/bpf directory. Let's not re-add them.

> xdping
> test_cpp
> *.skel.h
> /no_alu32
> /bpf_gcc
> /tools
> -bpf_helper_defs.h
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index cd98ae875e30..4889cc3ead4b 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -21,7 +21,7 @@ LLC ?= llc
> LLVM_OBJCOPY ?= llvm-objcopy
> BPF_GCC ?= $(shell command -v bpf-gcc;)
> CFLAGS += -g -Wall -O2 $(GENFLAGS) -I$(CURDIR) -I$(APIDIR) -I$(LIBDIR) \
> - -I$(BPFDIR) -I$(GENDIR) -I$(TOOLSINCDIR) \
> + -I$(GENDIR) -I$(TOOLSINCDIR) \
> -Dbpf_prog_load=bpf_prog_test_load \
> -Dbpf_load_program=bpf_test_load_program
> LDLIBS += -lcap -lelf -lz -lrt -lpthread
> @@ -129,7 +129,7 @@ $(OUTPUT)/runqslower: force
> $(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/runqslower \
> OUTPUT=$(CURDIR)/tools/
>
> -BPFOBJ := $(OUTPUT)/libbpf.a
> +BPFOBJ := $(BPFDIR)/libbpf.a

We can't do that. See fa633a0f8919 ("libbpf: Fix build on read-only
filesystems") for why and why we have this problem with
bpf_helper_defs.h in the first place.

>
> $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(OUTPUT)/test_stub.o $(BPFOBJ)
>
> @@ -155,17 +155,17 @@ force:
> DEFAULT_BPFTOOL := $(OUTPUT)/tools/sbin/bpftool
> BPFTOOL ?= $(DEFAULT_BPFTOOL)
>
> -$(DEFAULT_BPFTOOL): force
> +$(DEFAULT_BPFTOOL): force $(BPFOBJ)

do we need this? bpftool's makefile will build its own libbpf.a
independently. We can probably optimize that, but see above, we need
to ensure that we build only within selftest/bpf dirs.

This "read-only outside of selftests/bpf" requirement actually made me
realize that we probably need to specify OUTPUT pointing somewhere
inside selftests/bpf/tools subdir to build entire bpftool within
selftests/bpf directory and not touch anything outside. Do you mind
fixing that while you are at it?

> $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOLDIR) \
> prefix= DESTDIR=$(OUTPUT)/tools/ install
>
> $(BPFOBJ): force
> - $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(OUTPUT)/
> + $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BPFDIR)/ $(BPFOBJ)
>
> -BPF_HELPERS := $(OUTPUT)/bpf_helper_defs.h $(wildcard $(BPFDIR)/bpf_*.h)
> -$(OUTPUT)/bpf_helper_defs.h: $(BPFOBJ)
> +BPF_HELPERS := $(BPFDIR)/bpf_helper_defs.h $(wildcard $(BPFDIR)/bpf_*.h)
> +$(BPFDIR)/bpf_helper_defs.h: $(BPFOBJ)
> $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) \
> - OUTPUT=$(OUTPUT)/ $(OUTPUT)/bpf_helper_defs.h
> + OUTPUT=$(BPFDIR)/ $(BPFDIR)/bpf_helper_defs.h
>
> # Get Clang's default includes on this system, as opposed to those seen by
> # '-target bpf'. This fixes "missing" files on some architectures/distros,
> @@ -186,7 +186,7 @@ MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
> CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
> BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) \
> -I$(OUTPUT) -I$(CURDIR) -I$(CURDIR)/include/uapi \
> - -I$(APIDIR) -I$(LIBDIR) -I$(BPFDIR) -I$(abspath $(OUTPUT)/../usr/include)
> + -I$(APIDIR) -I$(LIBDIR) -I$(abspath $(OUTPUT)/../usr/include)
>
> CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
> -Wno-compare-distinct-pointer-types
>

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