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4 daysrust: cpu: Add CpuId::current() to retrieve current CPU IDViresh Kumar
Introduce `CpuId::current()`, a constructor that wraps the C function `raw_smp_processor_id()` to retrieve the current CPU identifier without guaranteeing stability. This function should be used only when the caller can ensure that the CPU ID won't change unexpectedly due to preemption or migration. Suggested-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Boqun Feng <boqun.feng@gmail.com>