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clocksource/drivers/samsung_pwm_timer: Prevent ftrace recursion

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Currently samsung_pwm_timer can be used as a scheduler clock. We properly
marked samsung_read_sched_clock() as notrace but we then call another
function samsung_clocksource_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 samsung_clocksource_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 16:02:35 +08:00
committed by Daniel Lezcano
parent f8af0e9c64
commit b8725dab66
1 changed files with 1 additions and 1 deletions
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drivers/clocksource/samsung_pwm_timer.c
+1 -1
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@@ -307,7 +307,7 @@ static void samsung_clocksource_resume(struct clocksource *cs)
samsung_time_start(pwm.source_id, true); samsung_time_start(pwm.source_id, true);
} }
static cycle_t samsung_clocksource_read(struct clocksource *c) static cycle_t notrace samsung_clocksource_read(struct clocksource *c)
{ {
return ~readl_relaxed(pwm.source_reg); return ~readl_relaxed(pwm.source_reg);
} }