use #[repr(C)] instead of #[repr(packed)] to avoid warning

kernel/src/drivers/bus/virtio_mmio.rs

@@ -13,7 +13,7 @@ use super::super::gpu::virtio_gpu;
 use super::super::net::virtio_net;
 
 // virtio 4.2.4 Legacy interface
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 pub struct VirtIOHeader {
     magic: ReadOnly<u32>, // 0x000
@@ -64,7 +64,7 @@ bitflags! {
     }
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 pub struct VirtIOVirtqueueDesc {
     pub addr: Volatile<u64>,
@@ -81,7 +81,7 @@ bitflags! {
     }
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 pub struct VirtIOVirtqueueAvailableRing {
     pub flags: Volatile<u16>,
@@ -90,14 +90,14 @@ pub struct VirtIOVirtqueueAvailableRing {
     used_event: Volatile<u16>
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 pub struct VirtIOVirtqueueUsedElem {
     id: Volatile<u32>,
     len: Volatile<u32>
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 pub struct VirtIOVirtqueueUsedRing {
     pub flags: Volatile<u16>,

kernel/src/drivers/gpu/virtio_gpu.rs

@@ -33,7 +33,7 @@ struct VirtIOGpu {
     rect: VirtIOGpuRect
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 struct VirtIOGpuConfig {
     events_read: ReadOnly<u32>,
@@ -88,7 +88,7 @@ const VIRTIO_GPU_RESP_ERR_INVALID_SCANOUT_ID : u32 = 0x1202;
 
 const VIRTIO_GPU_FLAG_FENCE : u32 = 1 << 0;
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 struct VirtIOGpuCtrlHdr {
     hdr_type: u32,
@@ -110,7 +110,7 @@ impl VirtIOGpuCtrlHdr {
     }
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug, Copy, Clone, Default)]
 struct VirtIOGpuRect {
     x: u32,
@@ -119,7 +119,7 @@ struct VirtIOGpuRect {
     height: u32
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 struct VirtIOGpuRespDisplayInfo {
     header: VirtIOGpuCtrlHdr,
@@ -130,7 +130,7 @@ struct VirtIOGpuRespDisplayInfo {
 
 const VIRTIO_GPU_FORMAT_B8G8R8A8_UNORM: u32 = 1;
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 struct VirtIOGpuResourceCreate2D {
     header: VirtIOGpuCtrlHdr,
@@ -140,7 +140,7 @@ struct VirtIOGpuResourceCreate2D {
     height: u32
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 struct VirtIOGpuResourceAttachBacking {
     header: VirtIOGpuCtrlHdr,
@@ -151,7 +151,7 @@ struct VirtIOGpuResourceAttachBacking {
     padding: u32
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 struct VirtIOGpuSetScanout {
     header: VirtIOGpuCtrlHdr,
@@ -160,7 +160,7 @@ struct VirtIOGpuSetScanout {
     resource_id: u32
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 struct VirtIOGpuTransferToHost2D {
     header: VirtIOGpuCtrlHdr,
@@ -170,7 +170,7 @@ struct VirtIOGpuTransferToHost2D {
     padding: u32
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 struct VirtIOGpuResourceFlush {
     header: VirtIOGpuCtrlHdr,

kernel/src/drivers/net/virtio_net.rs

@@ -272,7 +272,7 @@ bitflags! {
     }
 }
 
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 struct VirtIONetworkConfig {
     mac: [u8; 6],
@@ -280,7 +280,7 @@ struct VirtIONetworkConfig {
 }
 
 // virtio 5.1.6 Device Operation
-#[repr(packed)]
+#[repr(C)]
 #[derive(Debug)]
 struct VirtIONetHeader {
     flags: Volatile<u8>,