linux-kernel - [PATCH 39/58] kernel/events/core.c: Add prototype for __weak stub of arch_perf_update

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Date:	Sun, 18 Nov 2012 21:28:18 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org
Cc:	Josh Triplett <josh@...htriplett.org>
Subject: [PATCH 39/58] kernel/events/core.c: Add prototype for __weak stub of arch_perf_update_userpage

kernel/events/core.c defines an empty stub of arch_perf_update_userpage
with __weak, for use on architectures without an alternate
implementation.  Define a prototype of that function, to satisfy gcc
(-Wmissing-prototypes) and Sparse (-Wdecl).

arch/x86/kernel/cpu/perf_event.c:1692:6: warning: no previous prototype for ‘arch_perf_update_userpage’ [-Wmissing-prototypes]

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---
 kernel/events/core.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 543638a..69ab633 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3353,6 +3353,8 @@ static void calc_timer_values(struct perf_event *event,
 	*running = ctx_time - event->tstamp_running;
 }
 
+void arch_perf_update_userpage(struct perf_event_mmap_page *userpg, u64 now);
+
 void __weak arch_perf_update_userpage(struct perf_event_mmap_page *userpg, u64 now)
 {
 }
-- 
1.7.10.4

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