Symbol: PERF_UPROBE_REF_CTR_OFFSET_BITS
kernel/events/core.c
11529
PERF_UPROBE_REF_CTR_OFFSET_SHIFT = 64 - PERF_UPROBE_REF_CTR_OFFSET_BITS,
tools/lib/bpf/libbpf.c
11668
if ((__u64)ref_ctr_off >= (1ULL << PERF_UPROBE_REF_CTR_OFFSET_BITS))