__kernel_read
n = __kernel_read(file, &(char){ 0 }, 1, NULL);
return __kernel_read(file, buf, count, pos);
bytes_read = __kernel_read(filp, buffers[-1].data,
ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos);
ret = __kernel_read(r->file, r->buf, sz, &file_off);
return __kernel_read(file, addr, count, &offset);