Hi Thomas, On Thu, 22 Sep 2016 15:58:03 +0200 Thomas Gleixner wrote:
> On Thu, 22 Sep 2016, Jisheng Zhang wrote: > > > 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. > > Kernel crash? Doesn't ftrace core prevent recursion? a recent similar issue: http://www.spinics.net/lists/arm-kernel/msg533480.html Thanks, Jisheng