linux-kernel - [PATCH 5/8] clocksource/drivers/vf_pit

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Date:	Wed, 28 Oct 2015 14:11:30 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	tglx@...utronix.de
Cc:	Jisheng Zhang <jszhang@...vell.com>,
	linux-kernel@...r.kernel.org (open list:CLOCKSOURCE, CLOC...)
Subject: [PATCH 5/8] clocksource/drivers/vf_pit_timer: Prevent ftrace recursion

From: Jisheng Zhang <jszhang@...vell.com>

Having a traceable function in the sched_clock() path leads to a recursion
within ftrace and a kernel crash.

We should not trace the pit_read_sched_clock() function. Fix this by adding a
notrace attribute to this function.

Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/vf_pit_timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/vf_pit_timer.c b/drivers/clocksource/vf_pit_timer.c
index f07ba99..a0e6c68 100644
--- a/drivers/clocksource/vf_pit_timer.c
+++ b/drivers/clocksource/vf_pit_timer.c
@@ -52,7 +52,7 @@ static inline void pit_irq_acknowledge(void)
 	__raw_writel(PITTFLG_TIF, clkevt_base + PITTFLG);
 }
 
-static u64 pit_read_sched_clock(void)
+static u64 notrace pit_read_sched_clock(void)
 {
 	return ~__raw_readl(clksrc_base + PITCVAL);
 }
-- 
1.9.1

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