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clocksource/drivers/prima2: Prevent ftrace recursion 

Currently prima2 timer can be used as a scheduler clock. We properly
marked sirfsoc_read_sched_clock() as notrace but we then call another
function sirfsoc_timer_read() that _wasn't_ notrace.

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

Fix this by adding notrace attribute to the sirfsoc_timer_read() 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 16:02:37 +08:00 committed by Daniel Lezcano
parent b8725dab66
commit cdc68ec018
1 changed files with 1 additions and 1 deletions
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2
drivers/clocksource/timer-prima2.c
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@ -73,7 +73,7 @@ static irqreturn_t sirfsoc_timer_interrupt(int irq, void *dev_id)
}
/* read 64-bit timer counter */
static cycle_t sirfsoc_timer_read(struct clocksource *cs)
static cycle_t notrace sirfsoc_timer_read(struct clocksource *cs)
{
u64 cycles;