netdev - Re: [PATCH V2] selftests: Fix build when $(O) points to a relative path

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Date:   Fri, 25 Feb 2022 22:22:08 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>
Cc:     usama.anjum@...labora.com, kernel@...labora.com,
        kernelci@...ups.io, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH V2] selftests: Fix build when $(O) points to a relative
 path

Any thoughts about it?

On 2/17/22 3:38 AM, Muhammad Usama Anjum wrote:
> Build of bpf and tc-testing selftests fails when the relative path of
> the build directory is specified.
> 
> make -C tools/testing/selftests O=build0
> make[1]: Entering directory '/linux_mainline/tools/testing/selftests/bpf'
> ../../../scripts/Makefile.include:4: *** O=build0 does not exist.  Stop.
> make[1]: Entering directory '/linux_mainline/tools/testing/selftests/tc-testing'
> ../../../scripts/Makefile.include:4: *** O=build0 does not exist.  Stop.
> 
> Makefiles of bpf and tc-testing include scripts/Makefile.include file.
> This file has sanity checking inside it which checks the output path.
> The output path is not relative to the bpf or tc-testing. The sanity
> check fails. Expand the output path to get rid of this error. The fix is
> the same as mentioned in commit 150a27328b68 ("bpf, preload: Fix build
> when $(O) points to a relative path").
> 
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
> Changes in V2:
> Add more explaination to the commit message.
> Support make install as well.
> ---
>  tools/testing/selftests/Makefile | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index 4eda7c7c15694..6a5c25fcc9cfc 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -178,6 +178,7 @@ all: khdr
>  		BUILD_TARGET=$$BUILD/$$TARGET;			\
>  		mkdir $$BUILD_TARGET  -p;			\
>  		$(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET	\
> +				O=$(abs_objtree)		\
>  				$(if $(FORCE_TARGETS),|| exit);	\
>  		ret=$$((ret * $$?));				\
>  	done; exit $$ret;
> @@ -185,7 +186,8 @@ all: khdr
>  run_tests: all
>  	@for TARGET in $(TARGETS); do \
>  		BUILD_TARGET=$$BUILD/$$TARGET;	\
> -		$(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET run_tests;\
> +		$(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET run_tests \
> +				O=$(abs_objtree);		    \
>  	done;
>  
>  hotplug:
> @@ -236,6 +238,7 @@ ifdef INSTALL_PATH
>  	for TARGET in $(TARGETS); do \
>  		BUILD_TARGET=$$BUILD/$$TARGET;	\
>  		$(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET INSTALL_PATH=$(INSTALL_PATH)/$$TARGET install \
> +				O=$(abs_objtree)		\
>  				$(if $(FORCE_TARGETS),|| exit);	\
>  		ret=$$((ret * $$?));		\
>  	done; exit $$ret;