Subject: Re: [PATCH v6 01/11] kselftest: arm64: extend toplevel skeleton Makefile

From: Anders Roxell <[email-masked]>
Date: Tue, 17 Sep 2019 15:42:23 +0200

On 2019-09-10 13:31, Cristian Marussi wrote:
> Modify KSFT arm64 toplevel Makefile to maintain arm64 kselftests organized
> by subsystem, keeping them into distinct subdirectories under arm64 custom
> KSFT directory: tools/testing/selftests/arm64/
> 
> Add to such toplevel Makefile a mechanism to guess the effective location
> of Kernel headers as installed by KSFT framework.
> 
> Fit existing arm64 tags kselftest into this new schema moving them into
> their own subdirectory (arm64/tags).
> 
> Signed-off-by: Cristian Marussi <[email-masked]>
> ---
> Based on:
> commit 9ce1263033cd ("selftests, arm64: add a selftest for passing
> 		     tagged pointers to kernel")
> ---
> v5 --> v6
> - using realpath to avoid passing down relative paths
> - fix commit msg & Copyright
> - removed unneded Makefile export
> - added SUBTARGETS specification, to allow building specific only some
>   arm64 test subsystems
> v4 --> v5
> - rebased on arm64/for-next/core
> - merged this patch with KSFT arm64 tags patch, while moving the latter
>   into its own subdir
> - moved kernel header includes search mechanism from KSFT arm64
>   SIGNAL Makefile
> - export proper top_srcdir ENV for lib.mk
> v3 --> v4
> - comment reword
> - simplified documentation in README
> - dropped README about standalone
> ---
>  tools/testing/selftests/Makefile              |  1 +
>  tools/testing/selftests/arm64/Makefile        | 63 +++++++++++++++++--
>  tools/testing/selftests/arm64/README          | 25 ++++++++
>  tools/testing/selftests/arm64/tags/Makefile   |  6 ++
>  .../arm64/{ => tags}/run_tags_test.sh         |  0
>  .../selftests/arm64/{ => tags}/tags_test.c    |  0
>  6 files changed, 91 insertions(+), 4 deletions(-)
>  create mode 100644 tools/testing/selftests/arm64/README
>  create mode 100644 tools/testing/selftests/arm64/tags/Makefile
>  rename tools/testing/selftests/arm64/{ => tags}/run_tags_test.sh (100%)
>  rename tools/testing/selftests/arm64/{ => tags}/tags_test.c (100%)
> 
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index 25b43a8c2b15..1722dae9381a 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -1,5 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
>  TARGETS = android
> +TARGETS += arm64
>  TARGETS += bpf
>  TARGETS += breakpoints
>  TARGETS += capabilities
> diff --git a/tools/testing/selftests/arm64/Makefile b/tools/testing/selftests/arm64/Makefile
> index a61b2e743e99..cbb2a5a9e3fc 100644
> --- a/tools/testing/selftests/arm64/Makefile
> +++ b/tools/testing/selftests/arm64/Makefile
> @@ -1,11 +1,66 @@
>  # SPDX-License-Identifier: GPL-2.0
>  
> -# ARCH can be overridden by the user for cross compiling
> +# When ARCH not overridden for crosscompiling, lookup machine
>  ARCH ?= $(shell uname -m 2>/dev/null || echo not)
>  
>  ifneq (,$(filter $(ARCH),aarch64 arm64))
> -TEST_GEN_PROGS := tags_test
> -TEST_PROGS := run_tags_test.sh
> +SUBTARGETS ?= tags
> +else
> +SUBTARGETS :=
>  endif
>  
> -include ../lib.mk
> +CFLAGS := -Wall -O2 -g
> +
> +# A proper top_srcdir is needed by KSFT(lib.mk)
> +top_srcdir = $(realpath ../../../../)
> +
> +# Additional include paths needed by kselftest.h and local headers
> +CFLAGS += -I$(top_srcdir)/tools/testing/selftests/
> +
> +# Guessing where the Kernel headers could have been installed
> +# depending on ENV config
> +ifeq ($(KBUILD_OUTPUT),)
> +khdr_dir = $(top_srcdir)/usr/include
> +else
> +# the KSFT preferred location when KBUILD_OUTPUT is set
> +khdr_dir = $(KBUILD_OUTPUT)/kselftest/usr/include
> +endif
> +
> +CFLAGS += -I$(khdr_dir)
> +
> +export CFLAGS
> +export top_srcdir
> +
> +all:
> +	@for DIR in $(SUBTARGETS); do				\
> +		BUILD_TARGET=$(OUTPUT)/$$DIR;			\
> +		mkdir -p $$BUILD_TARGET;			\
> +		make OUTPUT=$$BUILD_TARGET -C $$DIR $@;		\
> +	done
> +
> +install: all
> +	@for DIR in $(SUBTARGETS); do				\
> +		BUILD_TARGET=$(OUTPUT)/$$DIR;			\
> +		make OUTPUT=$$BUILD_TARGET -C $$DIR $@;		\
> +	done
> +
> +run_tests: all
> +	@for DIR in $(SUBTARGETS); do				\
> +		BUILD_TARGET=$(OUTPUT)/$$DIR;			\
> +		make OUTPUT=$$BUILD_TARGET -C $$DIR $@;		\
> +	done
> +
> +# Avoid any output on non arm64 on emit_tests
> +emit_tests: all
> +	@for DIR in $(SUBTARGETS); do				\
> +		BUILD_TARGET=$(OUTPUT)/$$DIR;			\
> +		make OUTPUT=$$BUILD_TARGET -C $$DIR $@;		\
> +	done
> +
> +clean:
> +	@for DIR in $(SUBTARGETS); do				\
> +		BUILD_TARGET=$(OUTPUT)/$$DIR;			\
> +		make OUTPUT=$$BUILD_TARGET -C $$DIR $@;		\
> +	done
> +
> +.PHONY: all clean install run_tests emit_tests
> diff --git a/tools/testing/selftests/arm64/README b/tools/testing/selftests/arm64/README
> new file mode 100644
> index 000000000000..cc1e51796fee
> --- /dev/null
> +++ b/tools/testing/selftests/arm64/README
> @@ -0,0 +1,25 @@
> +KSelfTest ARM64
> +===============
> +
> +- These tests are arm64 specific and so not built or run but just skipped
> +  completely when env-variable ARCH is found to be different than 'arm64'
> +  and `uname -m` reports other than 'aarch64'.
> +
> +- Holding true the above, ARM64 KSFT tests can be run within the KSelfTest
> +  framework using standard Linux top-level-makefile targets:
> +
> +      $ make TARGETS=arm64 kselftest-clean
> +      $ make TARGETS=arm64 kselftest
> +
> +      or
> +
> +      $ make -C tools/testing/selftests TARGETS=arm64 \
> +		INSTALL_PATH=<your-installation-path> install
> +
> +      or, alternatively, only specific arm64/ subtargets can be picked:
> +
> +      $ make -C tools/testing/selftests TARGETS=arm64 SUBTARGETS="tags signal" \
> +		INSTALL_PATH=<your-installation-path> install
> +
> +   Further details on building and running KFST can be found in:
> +     Documentation/dev-tools/kselftest.rst
> diff --git a/tools/testing/selftests/arm64/tags/Makefile b/tools/testing/selftests/arm64/tags/Makefile
> new file mode 100644
> index 000000000000..dcc8b0467b68
> --- /dev/null
> +++ b/tools/testing/selftests/arm64/tags/Makefile
> @@ -0,0 +1,6 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +TEST_GEN_PROGS := tags_test

This should be TEST_GEN_FILES, since its used by run_tags_test.sh.
If its TEST_GEN_PROGS it will be added to the script run_kselftest.sh,
and I don't think thats the intent, even though it looked like that
before.

Cheers,
Anders

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