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| author |   Marco Elver <elver@google.com> | 2022-08-29 14:47:07 +0200 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-08-30 10:56:20 +0200 |
| commit | c5b81449f915a28bb9c7725e53aebab3ba39b4a2 (patch) | |
| tree | 1cd3e781dfed0f8a271bd0987aa26e4979dc3a3b /kernel/events/hw_breakpoint_test.c | |
| parent | perf/hw_breakpoint: Add KUnit test for constraints accounting (diff) | |
| download | linux-dev-c5b81449f915a28bb9c7725e53aebab3ba39b4a2.tar.xz linux-dev-c5b81449f915a28bb9c7725e53aebab3ba39b4a2.zip | |
perf/hw_breakpoint: Provide hw_breakpoint_is_used() and use in test
Provide hw_breakpoint_is_used() to check if breakpoints are in use on
the system.
Use it in the KUnit test to verify the global state before and after a
test case.
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20220829124719.675715-3-elver@google.com
Diffstat (limited to 'kernel/events/hw_breakpoint_test.c')
| -rw-r--r-- | kernel/events/hw_breakpoint_test.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/events/hw_breakpoint_test.c b/kernel/events/hw_breakpoint_test.c index 433c5c45e2a5..5ced822df788 100644 --- a/kernel/events/hw_breakpoint_test.c +++ b/kernel/events/hw_breakpoint_test.c @@ -294,7 +294,14 @@ static struct kunit_case hw_breakpoint_test_cases[] = { static int test_init(struct kunit *test) { /* Most test cases want 2 distinct CPUs. */ - return num_online_cpus() < 2 ? -EINVAL : 0; + if (num_online_cpus() < 2) + return -EINVAL; + + /* Want the system to not use breakpoints elsewhere. */ + if (hw_breakpoint_is_used()) + return -EBUSY; + + return 0; } static void test_exit(struct kunit *test) @@ -308,6 +315,9 @@ static void test_exit(struct kunit *test) kthread_stop(__other_task); __other_task = NULL; } + + /* Verify that internal state agrees that no breakpoints are in use. */ + KUNIT_EXPECT_FALSE(test, hw_breakpoint_is_used()); } static struct kunit_suite hw_breakpoint_test_suite = { |