Commit-ID: b8725dab66f0b2d57affb33a7f6ca094d9f1f8dd
Gitweb: http://git.kernel.org/tip/b8725dab66f0b2d57affb33a7f6ca094d9f1f8dd
Author: Jisheng Zhang <jszhang@xxxxxxxxxxx>
AuthorDate: Tue, 20 Oct 2015 16:02:35 +0800
Committer: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
CommitDate: Tue, 27 Oct 2015 01:33:41 +0100
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@xxxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
---
drivers/clocksource/samsung_pwm_timer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c
index bc90e13..9502bc4 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);
}
--
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