| Message ID | 20161124161033.11456-10-alex.bennee@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Nov 24, 2016 at 04:10:31PM +0000, Alex Bennée wrote: > This test has been written mainly to stress multi-threaded TCG behaviour > but will demonstrate failure by default on real hardware. The test takes > the following parameters: > > - "lock" use GCC's locking semantics > - "atomic" use GCC's __atomic primitives > - "wfelock" use WaitForEvent sleep > - "excl" use load/store exclusive semantics > > Also two more options allow the test to be tweaked > > - "noshuffle" disables the memory shuffling > - "count=%ld" set your own per-CPU increment count > > Signed-off-by: Alex Bennée <alex.bennee@linaro.org> > > --- > v2 > - Don't use thumb style strexeq stuff > - Add atomic and wfelock tests > - Add count/noshuffle test controls > - Move barrier tests to separate test file > v4 > - fix up unitests.cfg to use correct test name > - move into "locking" group, remove barrier tests > - use a table to add tests, mark which are expected to work > - correctly report XFAIL > v5 > - max out at -smp 4 in unittest.cfg > v7 > - make test control flags bools > - default the count to 100000 (so it doesn't timeout) > --- > arm/Makefile.common | 2 + > arm/locking-test.c | 302 ++++++++++++++++++++++++++++++++++++++++++++++++++++ > arm/unittests.cfg | 34 ++++++ > 3 files changed, 338 insertions(+) > create mode 100644 arm/locking-test.c > > diff --git a/arm/Makefile.common b/arm/Makefile.common > index 528166d..eb4cfdf 100644 > --- a/arm/Makefile.common > +++ b/arm/Makefile.common > @@ -15,6 +15,7 @@ tests-common += $(TEST_DIR)/pci-test.flat > tests-common += $(TEST_DIR)/gic.flat > tests-common += $(TEST_DIR)/tlbflush-code.flat > tests-common += $(TEST_DIR)/tlbflush-data.flat > +tests-common += $(TEST_DIR)/locking-test.flat > > all: test_cases > > @@ -85,3 +86,4 @@ test_cases: $(generated_files) $(tests-common) $(tests) > $(TEST_DIR)/selftest.o $(cstart.o): $(asm-offsets) > $(TEST_DIR)/tlbflush-code.elf: $(cstart.o) $(TEST_DIR)/tlbflush-code.o > $(TEST_DIR)/tlbflush-data.elf: $(cstart.o) $(TEST_DIR)/tlbflush-data.o > +$(TEST_DIR)/locking-test.elf: $(cstart.o) $(TEST_DIR)/locking-test.o Instead of adding a new test file, please extend the one we already have, which iirc was the first MTTCG test, arm/spinlock-test.c. If you don't like the naming or code in spinlock-test.c, then feel free to change it, delete it. It's currently not getting run by arm/unittests.cfg, and it's not getting maintained. > diff --git a/arm/locking-test.c b/arm/locking-test.c > new file mode 100644 > index 0000000..f10c61b > --- /dev/null > +++ b/arm/locking-test.c > @@ -0,0 +1,302 @@ > +#include <libcflat.h> > +#include <asm/smp.h> > +#include <asm/cpumask.h> > +#include <asm/barrier.h> > +#include <asm/mmu.h> > + > +#include <prng.h> > + > +#define MAX_CPUS 8 > + > +/* Test definition structure > + * > + * A simple structure that describes the test name, expected pass and > + * increment function. > + */ > + > +/* Function pointers for test */ > +typedef void (*inc_fn)(int cpu); > + > +typedef struct { > + const char *test_name; > + bool should_pass; > + inc_fn main_fn; > +} test_descr_t; > + > +/* How many increments to do */ > +static int increment_count = 1000000; > +static bool do_shuffle = true; > + > +/* Shared value all the tests attempt to safely increment using > + * various forms of atomic locking and exclusive behaviour. > + */ > +static unsigned int shared_value; > + > +/* PAGE_SIZE * uint32_t means we span several pages */ > +__attribute__((aligned(PAGE_SIZE))) static uint32_t memory_array[PAGE_SIZE]; > + > +/* We use the alignment of the following to ensure accesses to locking > + * and synchronisation primatives don't interfere with the page of the > + * shared value > + */ > +__attribute__((aligned(PAGE_SIZE))) static unsigned int per_cpu_value[MAX_CPUS]; > +__attribute__((aligned(PAGE_SIZE))) static cpumask_t smp_test_complete; > +__attribute__((aligned(PAGE_SIZE))) struct isaac_ctx prng_context[MAX_CPUS]; > + > +/* Some of the approaches use a global lock to prevent contention. */ > +static int global_lock; > + > +/* In any SMP setting this *should* fail due to cores stepping on > + * each other updating the shared variable > + */ > +static void increment_shared(int cpu) > +{ > + (void)cpu; > + > + shared_value++; > +} > + > +/* GCC __sync primitives are deprecated in favour of __atomic */ > +static void increment_shared_with_lock(int cpu) > +{ > + (void)cpu; > + > + while (__sync_lock_test_and_set(&global_lock, 1)); > + shared_value++; > + __sync_lock_release(&global_lock); > +} > + > +/* In practice even __ATOMIC_RELAXED uses ARM's ldxr/stex exclusive > + * semantics */ > +static void increment_shared_with_atomic(int cpu) > +{ > + (void)cpu; > + > + __atomic_add_fetch(&shared_value, 1, __ATOMIC_SEQ_CST); > +} > + > + > +/* > + * Load/store exclusive with WFE (wait-for-event) > + * > + * See ARMv8 ARM examples: > + * Use of Wait For Event (WFE) and Send Event (SEV) with locks > + */ > + > +static void increment_shared_with_wfelock(int cpu) > +{ > + (void)cpu; > + > +#if defined(__aarch64__) > + asm volatile( > + " mov w1, #1\n" > + " sevl\n" > + " prfm PSTL1KEEP, [%[lock]]\n" > + "1: wfe\n" > + " ldaxr w0, [%[lock]]\n" > + " cbnz w0, 1b\n" > + " stxr w0, w1, [%[lock]]\n" > + " cbnz w0, 1b\n" > + /* lock held */ > + " ldr w0, [%[sptr]]\n" > + " add w0, w0, #0x1\n" > + " str w0, [%[sptr]]\n" > + /* now release */ > + " stlr wzr, [%[lock]]\n" > + : /* out */ > + : [lock] "r" (&global_lock), [sptr] "r" (&shared_value) /* in */ > + : "w0", "w1", "cc"); > +#else > + asm volatile( > + " mov r1, #1\n" > + "1: ldrex r0, [%[lock]]\n" > + " cmp r0, #0\n" > + " wfene\n" > + " strexeq r0, r1, [%[lock]]\n" > + " cmpeq r0, #0\n" > + " bne 1b\n" > + " dmb\n" > + /* lock held */ > + " ldr r0, [%[sptr]]\n" > + " add r0, r0, #0x1\n" > + " str r0, [%[sptr]]\n" > + /* now release */ > + " mov r0, #0\n" > + " dmb\n" > + " str r0, [%[lock]]\n" > + " dsb\n" > + " sev\n" > + : /* out */ > + : [lock] "r" (&global_lock), [sptr] "r" (&shared_value) /* in */ > + : "r0", "r1", "cc"); > +#endif > +} > + > + > +/* > + * Hand-written version of the load/store exclusive > + */ > +static void increment_shared_with_excl(int cpu) > +{ > + (void)cpu; > + > +#if defined(__aarch64__) > + asm volatile( > + "1: ldxr w0, [%[sptr]]\n" > + " add w0, w0, #0x1\n" > + " stxr w1, w0, [%[sptr]]\n" > + " cbnz w1, 1b\n" > + : /* out */ > + : [sptr] "r" (&shared_value) /* in */ > + : "w0", "w1", "cc"); > +#else > + asm volatile( > + "1: ldrex r0, [%[sptr]]\n" > + " add r0, r0, #0x1\n" > + " strex r1, r0, [%[sptr]]\n" > + " cmp r1, #0\n" > + " bne 1b\n" > + : /* out */ > + : [sptr] "r" (&shared_value) /* in */ > + : "r0", "r1", "cc"); > +#endif > +} > + > +/* Test array */ > +static test_descr_t tests[] = { > + { "none", false, increment_shared }, > + { "lock", true, increment_shared_with_lock }, > + { "atomic", true, increment_shared_with_atomic }, > + { "wfelock", true, increment_shared_with_wfelock }, > + { "excl", true, increment_shared_with_excl } > +}; > + > +/* The idea of this is just to generate some random load/store > + * activity which may or may not race with an un-barried incremented > + * of the shared counter > + */ > +static void shuffle_memory(int cpu) > +{ > + int i; > + uint32_t lspat = isaac_next_uint32(&prng_context[cpu]); > + uint32_t seq = isaac_next_uint32(&prng_context[cpu]); > + int count = seq & 0x1f; > + uint32_t val=0; > + > + seq >>= 5; > + > + for (i=0; i<count; i++) { > + int index = seq & ~PAGE_MASK; > + if (lspat & 1) { > + val ^= memory_array[index]; > + } else { > + memory_array[index] = val; > + } > + seq >>= PAGE_SHIFT; > + seq ^= lspat; > + lspat >>= 1; > + } > + extra line here > +} > + > +static inc_fn increment_function; > + > +static void do_increment(void) > +{ > + int i; > + int cpu = smp_processor_id(); > + > + printf("CPU%d: online and ++ing\n", cpu); > + > + for (i=0; i < increment_count; i++) { > + per_cpu_value[cpu]++; > + increment_function(cpu); > + > + if (do_shuffle) > + shuffle_memory(cpu); > + } > + > + printf("CPU%d: Done, %d incs\n", cpu, per_cpu_value[cpu]); > + > + cpumask_set_cpu(cpu, &smp_test_complete); > + if (cpu != 0) > + halt(); > +} > + > +static void setup_and_run_test(test_descr_t *test) > +{ > + unsigned int i, sum = 0; > + int cpu, cpu_cnt = 0; > + > + increment_function = test->main_fn; > + > + /* fill our random page */ > + for (i=0; i<PAGE_SIZE; i++) { > + memory_array[i] = isaac_next_uint32(&prng_context[0]); > + } > + > + for_each_present_cpu(cpu) { > + uint32_t seed2 = isaac_next_uint32(&prng_context[0]); > + cpu_cnt++; > + if (cpu == 0) > + continue; > + > + isaac_init(&prng_context[cpu], (unsigned char *) &seed2, sizeof(seed2)); > + smp_boot_secondary(cpu, do_increment); > + } > + > + do_increment(); > + > + while (!cpumask_full(&smp_test_complete)) > + cpu_relax(); > + > + /* All CPUs done, do we add up */ > + for_each_present_cpu(cpu) { > + sum += per_cpu_value[cpu]; > + } > + > + if (test->should_pass) { > + report("total incs %d", sum == shared_value, shared_value); > + } else { > + report_xfail("total incs %d", true, sum == shared_value, shared_value); > + } > +} > + > +int main(int argc, char **argv) > +{ > + static const unsigned char seed[] = "myseed"; > + test_descr_t *test = &tests[0]; > + int i; > + unsigned int j; > + > + isaac_init(&prng_context[0], &seed[0], sizeof(seed)); > + > + for (i=0; i<argc; i++) { > + char *arg = argv[i]; > + > + /* Check for test name */ > + for (j = 0; j < ARRAY_SIZE(tests); j++) { > + if (strcmp(arg, tests[j].test_name) == 0) > + test = &tests[j]; > + } > + > + /* Test modifiers */ > + if (strcmp(arg, "noshuffle") == 0) { > + do_shuffle = false; > + report_prefix_push("noshuffle"); > + } else if (strstr(arg, "count=") != NULL) { > + char *p = strstr(arg, "="); > + increment_count = atol(p+1); > + } else { > + isaac_reseed(&prng_context[0], (unsigned char *) arg, strlen(arg)); > + } > + } > + > + if (test) { > + setup_and_run_test(test); > + } else { > + report("Unknown test", false); > + } > + > + return report_summary(); > +} > diff --git a/arm/unittests.cfg b/arm/unittests.cfg > index 7dc7799..abbfe79 100644 > --- a/arm/unittests.cfg > +++ b/arm/unittests.cfg > @@ -108,3 +108,37 @@ smp = $(($MAX_SMP>4?4:$MAX_SMP)) > extra_params = -append "page" > groups = tlbflush > > +# Locking tests > +[locking::none] > +file = locking-test.flat > +smp = $(($MAX_SMP>4?4:$MAX_SMP)) > +groups = locking > +accel = tcg > + > +[locking::lock] > +file = locking-test.flat > +smp = $(($MAX_SMP>4?4:$MAX_SMP)) > +extra_params = -append 'lock' > +groups = locking > +accel = tcg > + > +[locking::atomic] > +file = locking-test.flat > +smp = $(($MAX_SMP>4?4:$MAX_SMP)) > +extra_params = -append 'atomic' > +groups = locking > +accel = tcg > + > +[locking::wfelock] > +file = locking-test.flat > +smp = $(($MAX_SMP>4?4:$MAX_SMP)) > +extra_params = -append 'wfelock' > +groups = locking > +accel = tcg > + > +[locking::excl] > +file = locking-test.flat > +smp = $(($MAX_SMP>4?4:$MAX_SMP)) > +extra_params = -append 'excl' > +groups = locking > +accel = tcg > -- > 2.10.1 > I didn't look too closely at this one... Thanks, drew
diff --git a/arm/Makefile.common b/arm/Makefile.common index 528166d..eb4cfdf 100644 --- a/arm/Makefile.common +++ b/arm/Makefile.common @@ -15,6 +15,7 @@ tests-common += $(TEST_DIR)/pci-test.flat tests-common += $(TEST_DIR)/gic.flat tests-common += $(TEST_DIR)/tlbflush-code.flat tests-common += $(TEST_DIR)/tlbflush-data.flat +tests-common += $(TEST_DIR)/locking-test.flat all: test_cases @@ -85,3 +86,4 @@ test_cases: $(generated_files) $(tests-common) $(tests) $(TEST_DIR)/selftest.o $(cstart.o): $(asm-offsets) $(TEST_DIR)/tlbflush-code.elf: $(cstart.o) $(TEST_DIR)/tlbflush-code.o $(TEST_DIR)/tlbflush-data.elf: $(cstart.o) $(TEST_DIR)/tlbflush-data.o +$(TEST_DIR)/locking-test.elf: $(cstart.o) $(TEST_DIR)/locking-test.o diff --git a/arm/locking-test.c b/arm/locking-test.c new file mode 100644 index 0000000..f10c61b --- /dev/null +++ b/arm/locking-test.c @@ -0,0 +1,302 @@ +#include <libcflat.h> +#include <asm/smp.h> +#include <asm/cpumask.h> +#include <asm/barrier.h> +#include <asm/mmu.h> + +#include <prng.h> + +#define MAX_CPUS 8 + +/* Test definition structure + * + * A simple structure that describes the test name, expected pass and + * increment function. + */ + +/* Function pointers for test */ +typedef void (*inc_fn)(int cpu); + +typedef struct { + const char *test_name; + bool should_pass; + inc_fn main_fn; +} test_descr_t; + +/* How many increments to do */ +static int increment_count = 1000000; +static bool do_shuffle = true; + +/* Shared value all the tests attempt to safely increment using + * various forms of atomic locking and exclusive behaviour. + */ +static unsigned int shared_value; + +/* PAGE_SIZE * uint32_t means we span several pages */ +__attribute__((aligned(PAGE_SIZE))) static uint32_t memory_array[PAGE_SIZE]; + +/* We use the alignment of the following to ensure accesses to locking + * and synchronisation primatives don't interfere with the page of the + * shared value + */ +__attribute__((aligned(PAGE_SIZE))) static unsigned int per_cpu_value[MAX_CPUS]; +__attribute__((aligned(PAGE_SIZE))) static cpumask_t smp_test_complete; +__attribute__((aligned(PAGE_SIZE))) struct isaac_ctx prng_context[MAX_CPUS]; + +/* Some of the approaches use a global lock to prevent contention. */ +static int global_lock; + +/* In any SMP setting this *should* fail due to cores stepping on + * each other updating the shared variable + */ +static void increment_shared(int cpu) +{ + (void)cpu; + + shared_value++; +} + +/* GCC __sync primitives are deprecated in favour of __atomic */ +static void increment_shared_with_lock(int cpu) +{ + (void)cpu; + + while (__sync_lock_test_and_set(&global_lock, 1)); + shared_value++; + __sync_lock_release(&global_lock); +} + +/* In practice even __ATOMIC_RELAXED uses ARM's ldxr/stex exclusive + * semantics */ +static void increment_shared_with_atomic(int cpu) +{ + (void)cpu; + + __atomic_add_fetch(&shared_value, 1, __ATOMIC_SEQ_CST); +} + + +/* + * Load/store exclusive with WFE (wait-for-event) + * + * See ARMv8 ARM examples: + * Use of Wait For Event (WFE) and Send Event (SEV) with locks + */ + +static void increment_shared_with_wfelock(int cpu) +{ + (void)cpu; + +#if defined(__aarch64__) + asm volatile( + " mov w1, #1\n" + " sevl\n" + " prfm PSTL1KEEP, [%[lock]]\n" + "1: wfe\n" + " ldaxr w0, [%[lock]]\n" + " cbnz w0, 1b\n" + " stxr w0, w1, [%[lock]]\n" + " cbnz w0, 1b\n" + /* lock held */ + " ldr w0, [%[sptr]]\n" + " add w0, w0, #0x1\n" + " str w0, [%[sptr]]\n" + /* now release */ + " stlr wzr, [%[lock]]\n" + : /* out */ + : [lock] "r" (&global_lock), [sptr] "r" (&shared_value) /* in */ + : "w0", "w1", "cc"); +#else + asm volatile( + " mov r1, #1\n" + "1: ldrex r0, [%[lock]]\n" + " cmp r0, #0\n" + " wfene\n" + " strexeq r0, r1, [%[lock]]\n" + " cmpeq r0, #0\n" + " bne 1b\n" + " dmb\n" + /* lock held */ + " ldr r0, [%[sptr]]\n" + " add r0, r0, #0x1\n" + " str r0, [%[sptr]]\n" + /* now release */ + " mov r0, #0\n" + " dmb\n" + " str r0, [%[lock]]\n" + " dsb\n" + " sev\n" + : /* out */ + : [lock] "r" (&global_lock), [sptr] "r" (&shared_value) /* in */ + : "r0", "r1", "cc"); +#endif +} + + +/* + * Hand-written version of the load/store exclusive + */ +static void increment_shared_with_excl(int cpu) +{ + (void)cpu; + +#if defined(__aarch64__) + asm volatile( + "1: ldxr w0, [%[sptr]]\n" + " add w0, w0, #0x1\n" + " stxr w1, w0, [%[sptr]]\n" + " cbnz w1, 1b\n" + : /* out */ + : [sptr] "r" (&shared_value) /* in */ + : "w0", "w1", "cc"); +#else + asm volatile( + "1: ldrex r0, [%[sptr]]\n" + " add r0, r0, #0x1\n" + " strex r1, r0, [%[sptr]]\n" + " cmp r1, #0\n" + " bne 1b\n" + : /* out */ + : [sptr] "r" (&shared_value) /* in */ + : "r0", "r1", "cc"); +#endif +} + +/* Test array */ +static test_descr_t tests[] = { + { "none", false, increment_shared }, + { "lock", true, increment_shared_with_lock }, + { "atomic", true, increment_shared_with_atomic }, + { "wfelock", true, increment_shared_with_wfelock }, + { "excl", true, increment_shared_with_excl } +}; + +/* The idea of this is just to generate some random load/store + * activity which may or may not race with an un-barried incremented + * of the shared counter + */ +static void shuffle_memory(int cpu) +{ + int i; + uint32_t lspat = isaac_next_uint32(&prng_context[cpu]); + uint32_t seq = isaac_next_uint32(&prng_context[cpu]); + int count = seq & 0x1f; + uint32_t val=0; + + seq >>= 5; + + for (i=0; i<count; i++) { + int index = seq & ~PAGE_MASK; + if (lspat & 1) { + val ^= memory_array[index]; + } else { + memory_array[index] = val; + } + seq >>= PAGE_SHIFT; + seq ^= lspat; + lspat >>= 1; + } + +} + +static inc_fn increment_function; + +static void do_increment(void) +{ + int i; + int cpu = smp_processor_id(); + + printf("CPU%d: online and ++ing\n", cpu); + + for (i=0; i < increment_count; i++) { + per_cpu_value[cpu]++; + increment_function(cpu); + + if (do_shuffle) + shuffle_memory(cpu); + } + + printf("CPU%d: Done, %d incs\n", cpu, per_cpu_value[cpu]); + + cpumask_set_cpu(cpu, &smp_test_complete); + if (cpu != 0) + halt(); +} + +static void setup_and_run_test(test_descr_t *test) +{ + unsigned int i, sum = 0; + int cpu, cpu_cnt = 0; + + increment_function = test->main_fn; + + /* fill our random page */ + for (i=0; i<PAGE_SIZE; i++) { + memory_array[i] = isaac_next_uint32(&prng_context[0]); + } + + for_each_present_cpu(cpu) { + uint32_t seed2 = isaac_next_uint32(&prng_context[0]); + cpu_cnt++; + if (cpu == 0) + continue; + + isaac_init(&prng_context[cpu], (unsigned char *) &seed2, sizeof(seed2)); + smp_boot_secondary(cpu, do_increment); + } + + do_increment(); + + while (!cpumask_full(&smp_test_complete)) + cpu_relax(); + + /* All CPUs done, do we add up */ + for_each_present_cpu(cpu) { + sum += per_cpu_value[cpu]; + } + + if (test->should_pass) { + report("total incs %d", sum == shared_value, shared_value); + } else { + report_xfail("total incs %d", true, sum == shared_value, shared_value); + } +} + +int main(int argc, char **argv) +{ + static const unsigned char seed[] = "myseed"; + test_descr_t *test = &tests[0]; + int i; + unsigned int j; + + isaac_init(&prng_context[0], &seed[0], sizeof(seed)); + + for (i=0; i<argc; i++) { + char *arg = argv[i]; + + /* Check for test name */ + for (j = 0; j < ARRAY_SIZE(tests); j++) { + if (strcmp(arg, tests[j].test_name) == 0) + test = &tests[j]; + } + + /* Test modifiers */ + if (strcmp(arg, "noshuffle") == 0) { + do_shuffle = false; + report_prefix_push("noshuffle"); + } else if (strstr(arg, "count=") != NULL) { + char *p = strstr(arg, "="); + increment_count = atol(p+1); + } else { + isaac_reseed(&prng_context[0], (unsigned char *) arg, strlen(arg)); + } + } + + if (test) { + setup_and_run_test(test); + } else { + report("Unknown test", false); + } + + return report_summary(); +} diff --git a/arm/unittests.cfg b/arm/unittests.cfg index 7dc7799..abbfe79 100644 --- a/arm/unittests.cfg +++ b/arm/unittests.cfg @@ -108,3 +108,37 @@ smp = $(($MAX_SMP>4?4:$MAX_SMP)) extra_params = -append "page" groups = tlbflush +# Locking tests +[locking::none] +file = locking-test.flat +smp = $(($MAX_SMP>4?4:$MAX_SMP)) +groups = locking +accel = tcg + +[locking::lock] +file = locking-test.flat +smp = $(($MAX_SMP>4?4:$MAX_SMP)) +extra_params = -append 'lock' +groups = locking +accel = tcg + +[locking::atomic] +file = locking-test.flat +smp = $(($MAX_SMP>4?4:$MAX_SMP)) +extra_params = -append 'atomic' +groups = locking +accel = tcg + +[locking::wfelock] +file = locking-test.flat +smp = $(($MAX_SMP>4?4:$MAX_SMP)) +extra_params = -append 'wfelock' +groups = locking +accel = tcg + +[locking::excl] +file = locking-test.flat +smp = $(($MAX_SMP>4?4:$MAX_SMP)) +extra_params = -append 'excl' +groups = locking +accel = tcg
This test has been written mainly to stress multi-threaded TCG behaviour but will demonstrate failure by default on real hardware. The test takes the following parameters: - "lock" use GCC's locking semantics - "atomic" use GCC's __atomic primitives - "wfelock" use WaitForEvent sleep - "excl" use load/store exclusive semantics Also two more options allow the test to be tweaked - "noshuffle" disables the memory shuffling - "count=%ld" set your own per-CPU increment count Signed-off-by: Alex Bennée <alex.bennee@linaro.org> --- v2 - Don't use thumb style strexeq stuff - Add atomic and wfelock tests - Add count/noshuffle test controls - Move barrier tests to separate test file v4 - fix up unitests.cfg to use correct test name - move into "locking" group, remove barrier tests - use a table to add tests, mark which are expected to work - correctly report XFAIL v5 - max out at -smp 4 in unittest.cfg v7 - make test control flags bools - default the count to 100000 (so it doesn't timeout) --- arm/Makefile.common | 2 + arm/locking-test.c | 302 ++++++++++++++++++++++++++++++++++++++++++++++++++++ arm/unittests.cfg | 34 ++++++ 3 files changed, 338 insertions(+) create mode 100644 arm/locking-test.c