From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: tglx@linutronix.de
Cc: Jisheng Zhang <jszhang@marvell.com>,
linux-kernel@vger.kernel.org (open list:CLOCKSOURCE, CLOC...)
Subject: [PATCH 5/8] clocksource/drivers/vf_pit_timer: Prevent ftrace recursion
Date: Wed, 28 Oct 2015 14:11:30 +0100 [thread overview]
Message-ID: <1446037894-22601-5-git-send-email-daniel.lezcano@linaro.org> (raw)
In-Reply-To: <1446037894-22601-1-git-send-email-daniel.lezcano@linaro.org>
From: Jisheng Zhang <jszhang@marvell.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@marvell.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.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
next prev parent reply other threads:[~2015-10-28 13:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-28 13:10 [PULL] clockevents: fixes for 4.3-rc7 Daniel Lezcano
2015-10-28 13:11 ` [PATCH 1/8] clocksource/drivers/arm_global_timer: Prevent ftrace recursion Daniel Lezcano
2015-10-28 13:11 ` [PATCH 2/8] clocksource/drivers/pistachio: " Daniel Lezcano
2015-10-28 13:11 ` [PATCH 3/8] clocksource/drivers/samsung_pwm_timer: " Daniel Lezcano
2015-10-28 13:11 ` [PATCH 4/8] clocksource/drivers/prima2: " Daniel Lezcano
2015-10-28 13:11 ` Daniel Lezcano [this message]
2015-10-28 13:11 ` [PATCH 6/8] clocksource/drivers/fsl_ftm_timer: " Daniel Lezcano
2015-10-28 13:11 ` [PATCH 7/8] clocksource/drivers/digicolor: " Daniel Lezcano
2015-10-28 13:11 ` [PATCH 8/8] clocksource/drivers/sh_mtu2: Fix multiple shutdown call issue Daniel Lezcano
2015-10-30 9:43 ` [PULL] clockevents: fixes for 4.3-rc7 Thomas Gleixner
2015-10-30 9:53 ` Daniel Lezcano
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