diff --git a/kernel/src/device/misc/tdxguest.rs b/kernel/src/device/misc/tdxguest.rs
index 32a46b446..214e6dc87 100644
--- a/kernel/src/device/misc/tdxguest.rs
+++ b/kernel/src/device/misc/tdxguest.rs
@@ -10,10 +10,7 @@ use aster_util::{field_ptr, safe_ptr::SafePtr};
 use device_id::{DeviceId, MinorId};
 use ostd::{
     const_assert,
-    mm::{
-        FrameAllocOptions, HasPaddr, HasSize, PAGE_SIZE, USegment, VmIo, dma::DmaCoherent,
-        io_util::HasVmReaderWriter,
-    },
+    mm::{FrameAllocOptions, HasPaddr, HasSize, PAGE_SIZE, USegment, VmIo, dma::DmaCoherent},
     sync::WaitQueue,
 };
 use tdx_guest::{
diff --git a/kernel/src/fs/configfs/mod.rs b/kernel/src/fs/configfs/mod.rs
index 76704dc9b..0240c8d8f 100644
--- a/kernel/src/fs/configfs/mod.rs
+++ b/kernel/src/fs/configfs/mod.rs
@@ -28,7 +28,7 @@ pub(super) fn init() {
 /// this function returns an error.
 ///
 /// [`ConfigFs`]: fs::ConfigFs
-#[cfg_attr(not(ktest), expect(dead_code))]
+#[cfg_attr(not(any(ktest, target_arch = "x86_64")), expect(dead_code))]
 pub fn register_subsystem(subsystem: Arc<dyn SysBranchNode>) -> Result<()> {
     ConfigRootNode::singleton().add_child(subsystem)?;
 
diff --git a/kernel/src/security/tsm.rs b/kernel/src/security/tsm.rs
index c06a5f6e2..0de98bed1 100644
--- a/kernel/src/security/tsm.rs
+++ b/kernel/src/security/tsm.rs
@@ -86,7 +86,7 @@ const TSM_INBLOB_MAX: usize = 64;
 ///
 /// The states and their transitions are summarized in the table below.
 ///
-/// ```
+/// ```text
 /// ┌────────────────┐
 /// │InblobNeeded    │
 /// │(initial)       │
@@ -216,7 +216,7 @@ inherit_sys_leaf_node!(ReportNode, fields, {
             "provider" => {
                 let data = self.data.read();
                 let mut printer = VmPrinter::new_skip(writer, offset);
-                write!(printer, "{}\n", data.provider)?;
+                writeln!(printer, "{}", data.provider)?;
                 Ok(printer.bytes_written())
             }
 
@@ -256,7 +256,7 @@ inherit_sys_leaf_node!(ReportNode, fields, {
                     TsmProviderState::InblobProvided { generation, .. } => generation,
                     TsmProviderState::OutblobGenerated { generation, .. } => generation,
                 };
-                write!(printer, "{}\n", generation)?;
+                writeln!(printer, "{}", generation)?;
                 Ok(printer.bytes_written())
             }