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Date:   Wed, 15 Jan 2020 09:22:01 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-rdma@...r.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        clang-built-linux@...glegroups.com
Subject: Re: [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@...hat.com> wrote:
>
> From: Toke Høiland-Jørgensen <toke@...hat.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@...hat.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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