[PATCH -next] perf: Remove unused extern declaration arch_perf_get_page_size()

[YueHaibing]

commit 8af26be06272 ("perf/core: Fix arch_perf_get_page_size()")
left behind this.

Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 include/linux/perf_event.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 2166a69e3bf2..198cc86b747e 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1860,10 +1860,6 @@ extern void arch_perf_update_userpage(struct perf_event *event,
 				      struct perf_event_mmap_page *userpg,
 				      u64 now);
 
-#ifdef CONFIG_MMU
-extern __weak u64 arch_perf_get_page_size(struct mm_struct *mm, unsigned long addr);
-#endif
-
 /*
  * Snapshot branch stack on software events.
  *
-- 
2.34.1