linux-kernel - Re: [PATCH] selftests: vDSO: fix Makefile so that it uses lib.mk correctly

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Date:   Mon, 17 Jul 2023 16:49:39 +0100
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Aditya Deshpande <aditya.deshpande@....com>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc:     Shuah Khan <shuah@...nel.org>, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] selftests: vDSO: fix Makefile so that it uses lib.mk
 correctly

On 17/07/2023 16:09, Aditya Deshpande wrote:
> kselftest.rst states that flags must be specified before including lib.mk,
> but the vDSO selftest Makefile does not follow this order. As a result,
> changes made by lib.mk to flags and other variables are overwritten by the
> Makefile. For example, it is impossible to pass CFLAGS to the compiler via
> make.
> 
> Rectify this by including lib.mk after assigning flag values.
> 
> Also change the paths of the generated programs from absolute to relative
> paths as lib.mk will now correctly prepend the output directory path to
> the program name as intended.
> 
> Cc: Shuah Khan <shuah@...nel.org>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Vincenzo Frascino <vincenzo.frascino@....com>

Reviewed-by: Vincenzo Frascino <vincenzo.frascino@....com>

> Signed-off-by: Aditya Deshpande <aditya.deshpande@....com>
> ---
>   tools/testing/selftests/vDSO/Makefile | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/testing/selftests/vDSO/Makefile b/tools/testing/selftests/vDSO/Makefile
> index d53a4d8008f9..19145210d044 100644
> --- a/tools/testing/selftests/vDSO/Makefile
> +++ b/tools/testing/selftests/vDSO/Makefile
> @@ -1,16 +1,15 @@
>   # SPDX-License-Identifier: GPL-2.0
> -include ../lib.mk
> -
>   uname_M := $(shell uname -m 2>/dev/null || echo not)
>   ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
>   
> -TEST_GEN_PROGS := $(OUTPUT)/vdso_test_gettimeofday $(OUTPUT)/vdso_test_getcpu
> -TEST_GEN_PROGS += $(OUTPUT)/vdso_test_abi
> -TEST_GEN_PROGS += $(OUTPUT)/vdso_test_clock_getres
> +TEST_GEN_PROGS := vdso_test_gettimeofday
> +TEST_GEN_PROGS += vdso_test_getcpu
> +TEST_GEN_PROGS += vdso_test_abi
> +TEST_GEN_PROGS += vdso_test_clock_getres
>   ifeq ($(ARCH),$(filter $(ARCH),x86 x86_64))
> -TEST_GEN_PROGS += $(OUTPUT)/vdso_standalone_test_x86
> +TEST_GEN_PROGS += vdso_standalone_test_x86
>   endif
> -TEST_GEN_PROGS += $(OUTPUT)/vdso_test_correctness
> +TEST_GEN_PROGS += vdso_test_correctness
>   
>   CFLAGS := -std=gnu99
>   CFLAGS_vdso_standalone_test_x86 := -nostdlib -fno-asynchronous-unwind-tables -fno-stack-protector
> @@ -19,7 +18,8 @@ ifeq ($(CONFIG_X86_32),y)
>   LDLIBS += -lgcc_s
>   endif
>   
> -all: $(TEST_GEN_PROGS)
> +include ../lib.mk
> +
>   $(OUTPUT)/vdso_test_gettimeofday: parse_vdso.c vdso_test_gettimeofday.c
>   $(OUTPUT)/vdso_test_getcpu: parse_vdso.c vdso_test_getcpu.c
>   $(OUTPUT)/vdso_test_abi: parse_vdso.c vdso_test_abi.c

-- 
Regards,
Vincenzo