clocksource/drivers/samsung_pwm_timer: Prevent ftrace recursion
authorJisheng Zhang <jszhang@marvell.com>
Tue, 20 Oct 2015 08:02:35 +0000 (16:02 +0800)
committerDaniel Lezcano <daniel.lezcano@linaro.org>
Tue, 27 Oct 2015 00:33:41 +0000 (01:33 +0100)
commitb8725dab66f0b2d57affb33a7f6ca094d9f1f8dd
treed779fcf6254908910c93f63f3d18d101559798fa
parentf8af0e9c644caf64d0f42dce816c18346c744a9f
clocksource/drivers/samsung_pwm_timer: Prevent ftrace recursion

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>
drivers/clocksource/samsung_pwm_timer.c