Re: [PATCH bpf-next 1/2] selftests: bpf: Fix incorrect kernel headers search path

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On Mon, Jan 30, 2023 at 10:36 AM Mathieu Desnoyers
<mathieu.desnoyers@xxxxxxxxxxxx> wrote:
>
> Use $(KHDR_INCLUDES) as lookup path for kernel headers. This prevents
> building against kernel headers from the build environment in scenarios
> where kernel headers are installed into a specific output directory
> (O=...).
>
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
> Acked-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
> Cc: <bpf@xxxxxxxxxxxxxxx>
> Cc: Shuah Khan <shuah@xxxxxxxxxx>
> Cc: linux-kselftest@xxxxxxxxxxxxxxx
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
> Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
> Cc: Andrii Nakryiko <andrii@xxxxxxxxxx>
> Cc: Martin KaFai Lau <martin.lau@xxxxxxxxx>
> Cc: Song Liu <song@xxxxxxxxxx>
> Cc: Yonghong Song <yhs@xxxxxx>
> Cc: John Fastabend <john.fastabend@xxxxxxxxx>
> Cc: KP Singh <kpsingh@xxxxxxxxxx>
> Cc: Stanislav Fomichev <sdf@xxxxxxxxxx>
> Cc: Hao Luo <haoluo@xxxxxxxxxx>
> Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
> Cc: Mykola Lysenko <mykolal@xxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx>    [5.18+]
> ---
>  tools/testing/selftests/bpf/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index c22c43bbee19..6998c816afef 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -327,7 +327,7 @@ endif
>  CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
>  BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN)          \
>              -I$(INCLUDE_DIR) -I$(CURDIR) -I$(APIDIR)                   \
> -            -I$(abspath $(OUTPUT)/../usr/include)
> +            $(KHDR_INCLUDES)

It breaks the build:
https://github.com/kernel-patches/bpf/actions/runs/4047075637/jobs/6960655246

make[1]: *** No rule to make target '/linux/bpf.h', needed by
'/tmp/work/bpf/bpf/tools/testing/selftests/bpf/bpf-helpers.rst'. Stop.



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