linux-kernel - Re: [RFC PATCH for 4.15 14/14] Restartable sequences: Provide self-tests

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Date:   Mon, 16 Oct 2017 14:23:02 +0000 (UTC)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Paul Turner <pjt@...gle.com>, Andrew Hunter <ahh@...gle.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Watson <davejwatson@...com>,
        Josh Triplett <josh@...htriplett.org>,
        Will Deacon <will.deacon@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Russell King <linux@....linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andi Kleen <andi@...stfloor.org>, Chris Lameter <cl@...ux.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ben Maurer <bmaurer@...com>,
        rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        shuah <shuah@...nel.org>,
        linux-kselftest <linux-kselftest@...r.kernel.org>,
        linux-api <linux-api@...r.kernel.org>
Subject: Re: [RFC PATCH for 4.15 14/14] Restartable sequences: Provide
 self-tests

----- On Oct 15, 2017, at 10:51 PM, Michael Ellerman mpe@...erman.id.au wrote:

> Mathieu Desnoyers <mathieu.desnoyers@...icios.com> writes:
> 
>> Implements two basic tests of RSEQ functionality, and one more
>> exhaustive parameterizable test.
>>
>> The first, "basic_test" only asserts that RSEQ works moderately
>> correctly.
>> E.g. that:
>> - The CPUID pointer works
>> - Code infinitely looping within a critical section will eventually be
>>   interrupted.
>> - Critical sections are interrupted by signals.
>>
>> "basic_percpu_ops_test" is a slightly more "realistic" variant,
>> implementing a few simple per-cpu operations and testing their
>> correctness.
>>
>> "param_test" is a parametrizable restartable sequences test. See
>> the "--help" output for usage.
> 
> Thanks for providing selftests :)
> 
> The Makefiles could use a little clean up:
>  - cpu-opv doesn't need libpthread
>  - you don't need to define your own rule just for building
>  - use TEST_GEN_PROGS to hook into the right parts of lib.mk
>  - .. which means you can use the clean rule in lib.mk
> 
> 
> I notice you didn't add rseq or cpu-opv to the list of TARGETS in
> tools/testing/selftests/Makefile, was that deliberate?

No, I think I just copied some other selftest which perhaps did
not have those rules back then.

> 
> Feel free to squash this patch in if you're happy to.
> 
> This still works with:
>  $ make -C tools/testing/selftests TARGETS=rseq
> 
> and:
>  $ cd tools/testing/selftests/rseq; make

Great ! I'll fold this patch in.

Thanks!

Mathieu

> 
> cheers
> 
> diff --git a/tools/testing/selftests/cpu-opv/Makefile
> b/tools/testing/selftests/cpu-opv/Makefile
> index 81d0596824ee..d41670ad5c43 100644
> --- a/tools/testing/selftests/cpu-opv/Makefile
> +++ b/tools/testing/selftests/cpu-opv/Makefile
> @@ -1,13 +1,9 @@
> CFLAGS += -O2 -Wall -g -I./ -I../../../../usr/include/
> -LDFLAGS += -lpthread
> 
> -TESTS = basic_cpu_opv_test
> +TEST_GEN_PROGS = basic_cpu_opv_test
> 
> -all: $(TESTS)
> -%: %.c cpu-op.c cpu-op.h
> -	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
> +all: $(TEST_GEN_PROGS)
> 
> -include ../lib.mk
> +$(TEST_GEN_PROGS): cpu-op.c cpu-op.h
> 
> -clean:
> -	$(RM) $(TESTS)
> +include ../lib.mk
> diff --git a/tools/testing/selftests/rseq/Makefile
> b/tools/testing/selftests/rseq/Makefile
> index 7f0153556b80..9f8257b4ce14 100644
> --- a/tools/testing/selftests/rseq/Makefile
> +++ b/tools/testing/selftests/rseq/Makefile
> @@ -1,13 +1,10 @@
> CFLAGS += -O2 -Wall -g -I./ -I../cpu-opv/ -I../../../../usr/include/
> -LDFLAGS += -lpthread
> +LDLIBS += -lpthread
> 
> -TESTS = basic_test basic_percpu_ops_test param_test
> +TEST_GEN_PROGS = basic_test basic_percpu_ops_test param_test
> 
> -all: $(TESTS)
> -%: %.c rseq.h rseq-*.h rseq.c ../cpu-opv/cpu-op.c ../cpu-opv/cpu-op.h
> -	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
> +all: $(TEST_GEN_PROGS)
> 
> -include ../lib.mk
> +$(TEST_GEN_PROGS): rseq.h rseq-*.h rseq.c ../cpu-opv/cpu-op.c
> ../cpu-opv/cpu-op.h
> 
> -clean:
> -	$(RM) $(TESTS)
> +include ../lib.mk

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com