Commit 36361abc authored Oct 20, 2015 by Jisheng Zhang Committed by Daniel Lezcano Oct 27, 2015

clocksource/drivers/vf_pit_timer: Prevent ftrace recursion



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>

parent cdc68ec0

drivers/clocksource/vf_pit_timer.c

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -52,7 +52,7 @@ static inline void pit_irq_acknowledge(void)
	__raw_writel(PITTFLG_TIF, clkevt_base + PITTFLG);		__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);		return ~__raw_readl(clksrc_base + PITCVAL);
	}		}