libtest: Improve the interrupt test timing

If no state change occurred during the test action, then assume a late
interrupt.

1 files changed, 8 insertions, 1 deletions

diff --git a/cpukit/libtest/t-test-interrupt.c b/cpukit/libtest/t-test-interrupt.c
index 5d83b7876a..85b9b6ff69 100644
--- a/cpukit/libtest/t-test-interrupt.c
+++ b/cpukit/libtest/t-test-interrupt.c
@@ -456,9 +456,16 @@ T_interrupt_test(const T_interrupt_test_config *config, void *arg)
 			lower_bound[sample] = lower - delta;
 
 			sample = (sample + 1) % T_INTERRUPT_SAMPLE_COUNT;
-		} else if (state == T_INTERRUPT_TEST_LATE) {
+		} else if (state == T_INTERRUPT_TEST_LATE ||
+		    state == T_INTERRUPT_TEST_ACTION) {
 			uint_fast32_t upper;
 
+			/*
+			 * If the state is T_INTERRUPT_TEST_ACTION, then there
+			 * was probably no interrupt during the action, so the
+			 * interrupt would be late.
+			 */
+
 			lower_sum -= lower_bound[sample];
 			lower_sum += busy;
 			lower_bound[sample] = busy;