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Subject[libtraceevent] hrtimer_expire_entry unknown op '{'

libtraceevent reports ` unknown op '{' ' while processing hrtimer_expire_entry event

cat /sys/kernel/debug/tracing/events/timer/hrtimer_expire_entry/format

name: hrtimer_expire_entry
ID: 91
field:unsigned short common_type; offset:0; size:2; signed:0;
field:unsigned char common_flags; offset:2; size:1; signed:0;
field:unsigned char common_preempt_count; offset:3; size:1; signed:0;
field:int common_pid; offset:4; size:4; signed:1;

field:void * hrtimer; offset:8; size:8; signed:0;
field:s64 now; offset:16; size:8; signed:1;
field:void * function; offset:24; size:8; signed:0;

print fmt: "hrtimer=%p function=%pf now=%llu", REC->hrtimer, REC->function, (unsigned long long)(((ktime_t) { .tv64 = REC->now }).tv64)


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