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

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Date:   Mon, 16 Oct 2017 13:51:57 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "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>
Cc:     linux-kernel@...r.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        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>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: Re: [RFC PATCH for 4.15 14/14] Restartable sequences: Provide self-tests

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?

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

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