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In coresight-etm4x drivers, etmv4_drvdata->spinlock can be held during __schedule() by perf_event_task_sched_out()/in(). Since etmv4_drvdata->spinlock type is spinlock_t and perf_event_task_sched_out()/in() is called after acquiring rq_lock, which is raw_spinlock_t (an unsleepable lock), this poses an issue in PREEMPT_RT kernel where spinlock_t is sleepable. To address this, change type etmv4_drvdata->spinlock in coresight-etm4x drivers, which can be called by perf_event_task_sched_out()/in(), from spinlock_t to raw_spinlock_t. Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com> Reviewed-by: James Clark <james.clark@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20250306121110.1647948-3-yeoreum.yun@arm.com