static void ctx_resched(struct perf_cpu_context *cpuctx,
			struct perf_event_context *task_ctx,
			enum event_type_t event_type)
{
	enum event_type_t ctx_event_type = event_type & EVENT_ALL;
	bool cpu_event = !!(event_type & EVENT_CPU);

	/*
	 * If pinned groups are involved, flexible groups also need to be
	 * scheduled out.
	 */
	if (event_type & EVENT_PINNED)
		event_type |= EVENT_FLEXIBLE;

	perf_pmu_disable(cpuctx->ctx.pmu);
	if (task_ctx)
		task_ctx_sched_out(cpuctx, task_ctx, event_type);

	/*
	 * Decide which cpu ctx groups to schedule out based on the types
	 * of events that caused rescheduling:
	 *  - EVENT_CPU: schedule out corresponding groups;
	 *  - EVENT_PINNED task events: schedule out EVENT_FLEXIBLE groups;
	 *  - otherwise, do nothing more.
	 */
	if (cpu_event)
		cpu_ctx_sched_out(cpuctx, ctx_event_type);
	else if (ctx_event_type & EVENT_PINNED)
		cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);

	perf_event_sched_in(cpuctx, task_ctx, current);
	perf_pmu_enable(cpuctx->ctx.pmu);
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.