leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

clocksource/drivers/ti-32k: Prevent ftrace recursion

Browse Source 
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>
Cc: daniel.lezcano@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20160922075621.3725-1-jszhang@marvell.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jisheng Zhang 2016-09-22 15:56:21 +08:00 committed by Thomas Gleixner
parent 6982530eab
commit 3aa601492b
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/clocksource/timer-ti-32k.c
View File

@ -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);