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intel64_timer_start_absolute() computed "expected - current_us" unsigned. A watchdog started with a delay of zero asks for a deadline that is already current, the subtraction wraps to nearly 2^64, and the comparator is set so far ahead that the timer never fires. The CONFIG_INTEL64_HPET_MIN_DELAY clamp in intel64_oneshot_start() cannot help: the wrapped value is enormous, not small. Ask for the shortest delay the hardware can take instead of wrapping, and let that existing minimum-delay logic pick it. It presents as ostest hanging in wdog_test with no output and no fault. apps/testing/ostest/wdog.c:281 calls wdtest_once(&test_wdog, param, 0), and NSEC2TICK() takes the next few delays (1ns, 10ns, ...) to zero ticks as well; wdtest_once() then spins forever in its "wait until the callback is triggered exactly once" loop. Impact: runtime, ARCH_INTEL64_HPET_ALARM only. Assisted-by: Claude:claude-opus-5 Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com> |
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