Fix warnings

Author: wyfcyx

os/src/drivers/gpu/mod.rs

@@ -7,7 +7,6 @@ use tinybmp::Bmp;
 use virtio_drivers::{VirtIOGpu, VirtIOHeader};
 const VIRTIO7: usize = 0x10007000;
 pub trait GpuDevice: Send + Sync + Any {
-    fn update_cursor(&self);
     fn get_framebuffer(&self) -> &mut [u8];
     fn flush(&self);
 }
@@ -64,5 +63,4 @@ impl GpuDevice for VirtIOGpuWrapper {
             core::slice::from_raw_parts_mut(ptr, self.fb.len())
         }
     }
-    fn update_cursor(&self) {}
 }

os/src/net/tcp.rs

@@ -18,7 +18,9 @@ pub struct TCP {
     pub target: IPv4,
     pub sport: u16,
     pub dport: u16,
+    #[allow(unused)]
     pub seq: u32,
+    #[allow(unused)]
     pub ack: u32,
     pub socket_index: usize,
 }