Sven Schnelle 6feeee8efc
s390/ftrace: fix endless recursion in function_graph tracer ...
The following sequence triggers a kernel stack overflow on s390x:
mount -t tracefs tracefs /sys/kernel/tracing
cd /sys/kernel/tracing
echo function_graph > current_tracer
[crash]
This is because preempt_count_{add,sub} are in the list of traced
functions, which can be demonstrated by:
echo preempt_count_add >set_ftrace_filter
echo function_graph > current_tracer
[crash]
The stack overflow happens because get_tod_clock_monotonic() gets called
by ftrace but itself calls preempt_{disable,enable}(), which leads to a
endless recursion. Fix this by using preempt_{disable,enable}_notrace().
Fixes: 011620688asvens@linux.ibm.com >
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com >
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com >
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