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| author | Jisheng Zhang <jszhang@marvell.com> | 2015-10-20 16:02:35 +0800 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2015-10-27 01:33:41 +0100 |
| commit | b8725dab66f0b2d57affb33a7f6ca094d9f1f8dd (patch) | |
| tree | d779fcf6254908910c93f63f3d18d101559798fa /drivers/clocksource/samsung_pwm_timer.c | |
| parent | f8af0e9c644caf64d0f42dce816c18346c744a9f (diff) | |
| download | lwn-b8725dab66f0b2d57affb33a7f6ca094d9f1f8dd.tar.gz lwn-b8725dab66f0b2d57affb33a7f6ca094d9f1f8dd.zip | |
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>
Diffstat (limited to 'drivers/clocksource/samsung_pwm_timer.c')
| -rw-r--r-- | drivers/clocksource/samsung_pwm_timer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c index bc90e13338cc..9502bc4c3f6d 100644 --- a/drivers/clocksource/samsung_pwm_timer.c +++ b/drivers/clocksource/samsung_pwm_timer.c @@ -307,7 +307,7 @@ static void samsung_clocksource_resume(struct clocksource *cs) 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); } |