user_stack_count 2936 kernel/trace/trace.c static DEFINE_PER_CPU(int, user_stack_count); user_stack_count 2960 kernel/trace/trace.c if (__this_cpu_read(user_stack_count)) user_stack_count 2963 kernel/trace/trace.c __this_cpu_inc(user_stack_count); user_stack_count 2979 kernel/trace/trace.c __this_cpu_dec(user_stack_count);