Messages in this thread Patch in this message | | | From | Jisheng Zhang <> | Subject | [PATCH] clocksource/drivers/ti-32k: Prevent ftrace recursion | Date | Thu, 22 Sep 2016 15:56:21 +0800 |
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Currently ti-32k can be used as a scheduler clock. We properly marked omap_32k_read_sched_clock() as notrace but we then call another function ti_32k_read_cycles() 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 ti_32k_read_cycles() function.
Signed-off-by: Jisheng Zhang <jszhang@marvell.com> --- drivers/clocksource/timer-ti-32k.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/clocksource/timer-ti-32k.c b/drivers/clocksource/timer-ti-32k.c index 92b7e39..cf5b14e 100644 --- a/drivers/clocksource/timer-ti-32k.c +++ b/drivers/clocksource/timer-ti-32k.c @@ -65,7 +65,7 @@ static inline struct ti_32k *to_ti_32k(struct clocksource *cs) return container_of(cs, struct ti_32k, cs); } -static cycle_t ti_32k_read_cycles(struct clocksource *cs) +static cycle_t notrace ti_32k_read_cycles(struct clocksource *cs) { struct ti_32k *ti = to_ti_32k(cs); -- 2.9.3
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