pid_t              22 include/linux/types.h typedef __kernel_pid_t		pid_t;
pid_t             139 tools/include/nolibc/nolibc.h typedef   signed int          pid_t;
pid_t              61 tools/testing/selftests/bpf/progs/pyperf.h typedef int pid_t;
pid_t              13 tools/testing/selftests/bpf/progs/strobemeta.h typedef uint32_t pid_t;