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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
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@ -1544,4 +1544,8 @@ int perf_event_exit_cpu(unsigned int cpu);
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#define perf_event_exit_cpu NULL
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#endif
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extern void __weak arch_perf_update_userpage(struct perf_event *event,
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struct perf_event_mmap_page *userpg,
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u64 now);
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#endif /* _LINUX_PERF_EVENT_H */
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