bit = trace_get_context_bit() + start;
if (unlikely(val & (1 << bit))) {
/*
- * It could be that preempt_count has not been updated during
- * a switch between contexts. Allow for a single recursion.
+ * If an interrupt occurs during a trace, and another trace
+ * happens in that interrupt but before the preempt_count is
+ * updated to reflect the new interrupt context, then this
+ * will think a recursion occurred, and the event will be dropped.
+ * Let a single instance happen via the TRANSITION_BIT to
+ * not drop those events.
*/
bit = TRACE_TRANSITION_BIT;
if (val & (1 << bit)) {