Messages in this thread Patch in this message | | | From | <> | Subject | [PATCH] time/sched_clock: mark sched_clock_read_begin as notrace | Date | Mon, 28 Sep 2020 18:49:52 +0800 |
| |
From: Quanyang Wang <quanyang.wang@windriver.com>
Since sched_clock_read_begin is called by notrace function sched_clock, it shouldn't be traceable either, or else __ftrace_graph_caller will run into a dead loop on the path (arm for instance):
ftrace_graph_caller prepare_ftrace_return function_graph_enter ftrace_push_return_trace trace_clock_local sched_clock sched_clock_read_begin
Fixes: 1b86abc1c645 ("sched_clock: Expose struct clock_read_data") Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com> --- kernel/time/sched_clock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c index 1c03eec6ca9b..58459e1359d7 100644 --- a/kernel/time/sched_clock.c +++ b/kernel/time/sched_clock.c @@ -68,7 +68,7 @@ static inline u64 notrace cyc_to_ns(u64 cyc, u32 mult, u32 shift) return (cyc * mult) >> shift; } -struct clock_read_data *sched_clock_read_begin(unsigned int *seq) +notrace struct clock_read_data *sched_clock_read_begin(unsigned int *seq) { *seq = raw_read_seqcount_latch(&cd.seq); return cd.read_data + (*seq & 1); -- 2.17.1
| |