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arch: nios2: timing: Fix timing cycles rollover

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Fix arch_timing_cycles_get() to prevent overflow on the clock rollover.

The issue is observable on tests/benchmarks/wait_queues and
tests/benchmarks/sched_queues with BENCHMARK_NUM_ITERATIONS is large
enough, e.g. default 1000.

Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>
This commit is contained in:
Dmitrii Golovanov 2024-12-24 19:46:16 +01:00 committed by Fabio Baltieri
parent 9fcb17400b
commit d2c19a0535
1 changed files with 7 additions and 1 deletions
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8
arch/nios2/core/timing.c
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@ -41,7 +41,13 @@ timing_t arch_timing_counter_get(void)
uint64_t arch_timing_cycles_get(volatile timing_t *const start, uint64_t arch_timing_cycles_get(volatile timing_t *const start,
volatile timing_t *const end) volatile timing_t *const end)
{ {
return (*end - *start); timing_t start_ = *start;
timing_t end_ = *end;
if (end_ >= start_) {
return (end_ - start_);
}
return (end_ + NIOS2_SUBTRACT_CLOCK_CYCLES(start_));
} }
uint64_t arch_timing_freq_get(void) uint64_t arch_timing_freq_get(void)