linux-kernel - Re: [PATCH v2 3/4] selftests: drop KSFT_KHDR

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Date:   Tue, 12 Jul 2022 15:57:56 +0100
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Kees Cook <keescook@...omium.org>, Tim.Bird@...y.com,
        kernel@...labora.com, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 3/4] selftests: drop KSFT_KHDR_INSTALL make target

On 12/07/2022 10:59, Anders Roxell wrote:
> On Tue, 12 Jul 2022 at 10:29, Guillaume Tucker
> <guillaume.tucker@...labora.com> wrote:
>>
>> Drop the KSFT_KHDR_INSTALL make target now that all use-cases have
>> been removed from the other kselftest Makefiles.
>>
>> Signed-off-by: Guillaume Tucker <guillaume.tucker@...labora.com>
>> ---
>>  tools/testing/selftests/Makefile |  1 -
>>  tools/testing/selftests/lib.mk   | 38 --------------------------------
>>  2 files changed, 39 deletions(-)
>>
>> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
>> index 619451e82863..e060777239a4 100644
>> --- a/tools/testing/selftests/Makefile
>> +++ b/tools/testing/selftests/Makefile
>> @@ -143,7 +143,6 @@ endif
>>  # Prepare for headers install
>>  include $(top_srcdir)/scripts/subarch.include
>>  ARCH           ?= $(SUBARCH)
>> -export KSFT_KHDR_INSTALL_DONE := 1
>>  export BUILD
>>  export KHDR_INCLUDES
>>
>> diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
>> index 2a2d240cdc1b..df5f853951f2 100644
>> --- a/tools/testing/selftests/lib.mk
>> +++ b/tools/testing/selftests/lib.mk
>> @@ -30,45 +30,7 @@ TEST_GEN_PROGS := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS))
>>  TEST_GEN_PROGS_EXTENDED := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS_EXTENDED))
>>  TEST_GEN_FILES := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_FILES))
>>
>> -ifdef KSFT_KHDR_INSTALL
>> -top_srcdir ?= ../../../..
>> -include $(top_srcdir)/scripts/subarch.include
>> -ARCH           ?= $(SUBARCH)
>> -
>> -# set default goal to all, so make without a target runs all, even when
>> -# all isn't the first target in the file.
>> -.DEFAULT_GOAL := all
>> -
>> -# Invoke headers install with --no-builtin-rules to avoid circular
>> -# dependency in "make kselftest" case. In this case, second level
>> -# make inherits builtin-rules which will use the rule generate
>> -# Makefile.o and runs into
>> -# "Circular Makefile.o <- prepare dependency dropped."
>> -# and headers_install fails and test compile fails.
>> -# O= KBUILD_OUTPUT cases don't run into this error, since main Makefile
>> -# invokes them as sub-makes and --no-builtin-rules is not necessary,
>> -# but doesn't cause any failures. Keep it simple and use the same
>> -# flags in both cases.
>> -# Note that the support to install headers from lib.mk is necessary
>> -# when test Makefile is run directly with "make -C".
>> -# When local build is done, headers are installed in the default
>> -# INSTALL_HDR_PATH usr/include.
>> -.PHONY: khdr
>> -.NOTPARALLEL:
>> -khdr:
>> -ifndef KSFT_KHDR_INSTALL_DONE
>> -ifeq (1,$(DEFAULT_INSTALL_HDR_PATH))
>> -       $(MAKE) --no-builtin-rules ARCH=$(ARCH) -C $(top_srcdir) headers_install
>> -else
>> -       $(MAKE) --no-builtin-rules INSTALL_HDR_PATH=$$OUTPUT/usr \
>> -               ARCH=$(ARCH) -C $(top_srcdir) headers_install
>> -endif
>> -endif
>> -
>> -all: khdr $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES)
>> -else
>>  all: $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES)
>> -endif
>>
>>  define RUN_TESTS
>>         BASE_DIR="$(selfdir)";                  \
> 
> Should this be removed as well, since 'khdr' gets droped from file the lib.mk ?
> 
> diff --git a/tools/testing/selftests/landlock/Makefile
> b/tools/testing/selftests/landlock/Makefile
> index 1313e44e8fb9..99f88c52d61a 100644
> --- a/tools/testing/selftests/landlock/Makefile
> +++ b/tools/testing/selftests/landlock/Makefile
> @@ -13,9 +13,6 @@ include ../lib.mk
> 
>  khdr_dir = $(top_srcdir)/usr/include
> 
> -$(khdr_dir)/linux/landlock.h: khdr
> -        @:
> -
>  $(OUTPUT)/true: true.c
>   $(LINK.c) $< $(LDLIBS) -o $@ -static


Good point, however I think I'll drop it in PATCH 1/4 "selftests:
drop khdr make target" as it's already dropped there.  Ideally,
the khdr dependency mentioned in this PATCH 3/4 should probably
also be removed in PATCH 1/4.  I'll send a v3 with this.

Thanks,
Guillaume