linux-kernel - [PATCH 6/8] clocksource/drivers/fsl_ftm

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Date:	Wed, 28 Oct 2015 14:11:31 +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 6/8] clocksource/drivers/fsl_ftm_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 ftm_read_sched_clock() function.

Fix this by adding the notrace attribute to this function.

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

diff --git a/drivers/clocksource/fsl_ftm_timer.c b/drivers/clocksource/fsl_ftm_timer.c
index ef43469..10202f1 100644
--- a/drivers/clocksource/fsl_ftm_timer.c
+++ b/drivers/clocksource/fsl_ftm_timer.c
@@ -118,7 +118,7 @@ static inline void ftm_reset_counter(void __iomem *base)
 	ftm_writel(0x00, base + FTM_CNT);
 }
 
-static u64 ftm_read_sched_clock(void)
+static u64 notrace ftm_read_sched_clock(void)
 {
 	return ftm_readl(priv->clksrc_base + FTM_CNT);
 }
-- 
1.9.1

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