37 type Result<T> = core::result::Result<T, SystemError>;  typedef
41     fn set_bpf_prog(&self, _bpf_prog: Arc<File>) -> Result<()> {  in set_bpf_prog()  argument
45     fn enable(&self) -> Result<()> {  in enable()  argument
49     fn disable(&self) -> Result<()> {  in disable()  argument
72     ) -> core::result::Result<(), SystemError> {  in remove_epoll()  argument
84     fn do_poll(&self) -> Result<usize> {  in do_poll()
91     fn epoll_callback(&self) -> Result<()> {  in epoll_callback()  argument
107     fn mmap(&self, start: usize, len: usize, offset: usize) -> Result<()> {  in mmap()  argument
110     fn open(&self, _data: SpinLockGuard<FilePrivateData>, _mode: &FileMode) -> Result<()> {  in open()  argument
113     fn close(&self, _data: SpinLockGuard<FilePrivateData>) -> Result<()> {  in close()  argument
122     ) -> Result<usize> {  in read_at()
132     ) -> Result<usize> {  in write_at()
136     fn poll(&self, _private_data: &FilePrivateData) -> Result<usize> {  in poll()
140     fn metadata(&self) -> Result<Metadata> {  in metadata()
149     fn resize(&self, _len: usize) -> Result<()> {  in resize()  argument
153     fn ioctl(&self, cmd: u32, data: usize, _private_data: &FilePrivateData) -> Result<usize> {  in ioctl()
183     ) -> core::result::Result<usize, SystemError> {  in kernel_ioctl()
199     fn list(&self) -> Result<Vec<String>> {  in list()
251     ) -> Result<usize> {  in sys_perf_event_open()
268 ) -> Result<usize> {  in perf_event_open()
313 pub fn perf_event_output(_ctx: *mut c_void, fd: usize, _flags: u32, data: &[u8]) -> Result<()> {  in perf_event_output()  argument
326 fn get_perf_event_file(fd: usize) -> Result<Arc<PerfEventInode>> {  in get_perf_event_file()