From: Jisheng Zhang Date: Thu, 22 Sep 2016 07:56:21 +0000 (+0800) Subject: clocksource/drivers/ti-32k: Prevent ftrace recursion X-Git-Tag: v4.9-rc1~152^2~1 X-Git-Url: http://git.cascardo.info/?p=cascardo%2Flinux.git;a=commitdiff_plain;h=3aa601492babdf3acdec89e5aa9c44e1a357a4d8 clocksource/drivers/ti-32k: Prevent ftrace recursion 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 Cc: daniel.lezcano@linaro.org Cc: linux-arm-kernel@lists.infradead.org Cc: Steven Rostedt Link: http://lkml.kernel.org/r/20160922075621.3725-1-jszhang@marvell.com Signed-off-by: Thomas Gleixner --- diff --git a/drivers/clocksource/timer-ti-32k.c b/drivers/clocksource/timer-ti-32k.c index 92b7e390f6c8..cf5b14e442e4 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);