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2024-05-16 8d2a02b24d66aa359e83eebc1ed3c0f85367a1cb

 kernel/include/linux/perf_event.h
..
..
@@ -1078,15 +1078,31 @@
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 			     struct pt_regs *regs);
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 static inline bool
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-is_default_overflow_handler(struct perf_event *event)
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+__is_default_overflow_handler(perf_overflow_handler_t overflow_handler)
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 {
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-	if (likely(event->overflow_handler == perf_event_output_forward))
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+	if (likely(overflow_handler == perf_event_output_forward))
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 		return true;
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-	if (unlikely(event->overflow_handler == perf_event_output_backward))
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+	if (unlikely(overflow_handler == perf_event_output_backward))
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 		return true;
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 	return false;
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 }
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+#define is_default_overflow_handler(event) \
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+	__is_default_overflow_handler((event)->overflow_handler)
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+
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+#ifdef CONFIG_BPF_SYSCALL
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+static inline bool uses_default_overflow_handler(struct perf_event *event)
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+{
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+	if (likely(is_default_overflow_handler(event)))
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+		return true;
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+
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+	return __is_default_overflow_handler(event->orig_overflow_handler);
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+}
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+#else
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+#define uses_default_overflow_handler(event) \
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+	is_default_overflow_handler(event)
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+#endif
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+
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 extern void
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 perf_event_header__init_id(struct perf_event_header *header,
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 			   struct perf_sample_data *data,