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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>
This commit is contained in:
Jisheng Zhang 2015-10-20 16:02:38 +08:00 committed by Daniel Lezcano
parent cdc68ec018
commit 36361abc8b
1 changed files with 1 additions and 1 deletions
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drivers/clocksource/vf_pit_timer.c
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@ -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);
} }