From: Greg Thelen <gthelen@google.com>
To: Shuah Khan <skhan@linuxfoundation.org>, Shuah Khan <shuah@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-kselftest@vger.kernel.org,
Shuah Khan <skhan@linuxfoundation.org>
Subject: Re: [PATCH] selftests: more general make nesting support
Date: Wed, 05 Aug 2020 13:40:15 -0700 [thread overview]
Message-ID: <xr93zh78bzdc.fsf@gthelen.svl.corp.google.com> (raw)
In-Reply-To: <3d949545-a7f2-4057-1204-600eabfd8f28@linuxfoundation.org>
Shuah Khan <skhan@linuxfoundation.org> wrote:
> On 8/5/20 1:36 PM, Greg Thelen wrote:
>> On Tue, Jul 28, 2020 at 12:32 AM Greg Thelen <gthelen@google.com> wrote:
>>>
>>> selftests can be built from the toplevel kernel makefile (e.g. make
>>> kselftest-all) or directly (make -C tools/testing/selftests all).
>>>
>>> The toplevel kernel makefile explicitly disables implicit rules with
>>> "MAKEFLAGS += -rR", which is passed to tools/testing/selftests. Some
>>> selftest makefiles require implicit make rules, which is why
>>> commit 67d8712dcc70 ("selftests: Fix build failures when invoked from
>>> kselftest target") reenables implicit rules by clearing MAKEFLAGS if
>>> MAKELEVEL=1.
>>>
>>> So far so good. However, if the toplevel makefile is called from an
>>> outer makefile then MAKELEVEL will be elevated, which breaks the
>>> MAKELEVEL equality test.
>>> Example wrapped makefile error:
>>> $ cat ~/Makefile
>>> all:
>>> $(MAKE) defconfig
>>> $(MAKE) kselftest-all
>>> $ make -sf ~/Makefile
>>> futex_wait_timeout.c /src/tools/testing/selftests/kselftest_harness.h /src/tools/testing/selftests/kselftest.h ../include/futextest.h ../include/atomic.h ../include/logging.h -lpthread -lrt -o /src/tools/testing/selftests/futex/functional/futex_wait_timeout
>>> make[4]: futex_wait_timeout.c: Command not found
>>>
>>> Rather than checking $(MAKELEVEL), check for $(LINK.c), which is a more
>>> direct side effect of "make -R". This enables arbitrary makefile
>>> nesting.
>>>
>>> Signed-off-by: Greg Thelen <gthelen@google.com>
>>> ---
>>> tools/testing/selftests/Makefile | 8 ++++----
>>> 1 file changed, 4 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
>>> index 1195bd85af38..289a2e4b3f6f 100644
>>> --- a/tools/testing/selftests/Makefile
>>> +++ b/tools/testing/selftests/Makefile
>>> @@ -84,10 +84,10 @@ endif
>>> # of the targets gets built.
>>> FORCE_TARGETS ?=
>>>
>>> -# Clear LDFLAGS and MAKEFLAGS if called from main
>>> -# Makefile to avoid test build failures when test
>>> -# Makefile doesn't have explicit build rules.
>>> -ifeq (1,$(MAKELEVEL))
>>> +# Clear LDFLAGS and MAKEFLAGS when implicit rules are missing. This provides
>>> +# implicit rules to sub-test Makefiles which avoids build failures in test
>>> +# Makefile that don't have explicit build rules.
>>> +ifeq (,$(LINK.c))
>>> override LDFLAGS =
>>> override MAKEFLAGS =
>>> endif
>>> --
>>> 2.28.0.rc0.142.g3c755180ce-goog
>>
>> Is there any feedback on this patch? It's not high priority but something that
>> will help me make more use of selftests.
>>
>
> No issues with the patch. I will apply it once the merge window ends.
>
> thanks,
> -- Shuah
Great. Thank you.
prev parent reply other threads:[~2020-08-05 20:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-28 7:32 [PATCH] selftests: more general make nesting support Greg Thelen
2020-08-05 19:36 ` Greg Thelen
2020-08-05 19:50 ` Shuah Khan
2020-08-05 20:40 ` Greg Thelen [this message]
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