kernel/events: Add a missing prototype for arch_perf_update_userpage()

... in order to fix a -Wmissing-prototype warning.

No functional changes.

Signed-off-by: Benjamin Thiel <b.thiel@posteo.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200109131351.9468-1-b.thiel@posteo.de

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 6d4c22aee38483a34362e3d56c3c22108645fe1f..52928e089bc7f452565801613c98cb394a6a1c8c 100644 (file)
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1544,4 +1544,8 @@ int perf_event_exit_cpu(unsigned int cpu);
 #define perf_event_exit_cpu    NULL
 #endif
 
+extern void __weak arch_perf_update_userpage(struct perf_event *event,
+                                            struct perf_event_mmap_page *userpg,
+                                            u64 now);
+
 #endif /* _LINUX_PERF_EVENT_H */