diff --git a/fs/memfs/src/block.rs b/fs/memfs/src/block.rs
index e02dd6c..e3c9289 100644
--- a/fs/memfs/src/block.rs
+++ b/fs/memfs/src/block.rs
@@ -13,6 +13,9 @@ pub struct BlockRef<'a, A: BlockAllocator + Copy> {
 
 pub unsafe trait BlockAllocator {
     fn alloc(&self) -> *mut u8;
+    /// # Safety
+    ///
+    /// Unsafe: accepts arbitrary block addresses
     unsafe fn dealloc(&self, block: *mut u8);
 }
 
@@ -42,6 +45,9 @@ impl<'a, A: BlockAllocator + Copy> BlockRef<'a, A> {
         }
     }
 
+    /// # Safety
+    ///
+    /// Unsafe: does not perform checks on `data` pointer
     pub unsafe fn from_raw(alloc: A, data: *mut u8) -> Self {
         Self {
             inner: Some(&mut *(data as *mut _)),
diff --git a/fs/memfs/src/file.rs b/fs/memfs/src/file.rs
index b2d59b7..2348625 100644
--- a/fs/memfs/src/file.rs
+++ b/fs/memfs/src/file.rs
@@ -48,7 +48,7 @@ impl<'a, A: BlockAllocator + Copy + 'static> VnodeImpl for FileInode<'a, A> {
         Ok(self.data.size())
     }
 
-    fn stat(&mut self, node: VnodeRef, stat: &mut Stat) -> Result<(), Errno> {
+    fn stat(&mut self, _node: VnodeRef, stat: &mut Stat) -> Result<(), Errno> {
         stat.size = self.data.size() as u64;
         stat.blksize = 4096;
         stat.mode = 0o755;
diff --git a/fs/memfs/src/lib.rs b/fs/memfs/src/lib.rs
index e4a3462..22ad694 100644
--- a/fs/memfs/src/lib.rs
+++ b/fs/memfs/src/lib.rs
@@ -49,6 +49,9 @@ impl<A: BlockAllocator + Copy + 'static> Filesystem for Ramfs<A> {
 }
 
 impl<A: BlockAllocator + Copy + 'static> Ramfs<A> {
+    /// # Safety
+    ///
+    /// Unsafe: accepts arbitrary `base` and `size` parameters
     pub unsafe fn open(base: *const u8, size: usize, alloc: A) -> Result<Rc<Self>, Errno> {
         let res = Rc::new(Self {
             root: RefCell::new(None),
@@ -90,8 +93,7 @@ impl<A: BlockAllocator + Copy + 'static> Ramfs<A> {
                     return Err(Errno::DoesNotExist);
                 }
                 // TODO file modes
-                let node = at.create(element, FileMode::default_dir(), VnodeKind::Directory)?;
-                node
+                at.create(element, FileMode::default_dir(), VnodeKind::Directory)?
             }
         };
 
diff --git a/fs/vfs/src/fs.rs b/fs/vfs/src/fs.rs
index 8708706..0496601 100644
--- a/fs/vfs/src/fs.rs
+++ b/fs/vfs/src/fs.rs
@@ -11,5 +11,5 @@ pub trait Filesystem {
     /// Returns storage device of the filesystem (if any)
     fn dev(self: Rc<Self>) -> Option<&'static dyn BlockDevice>;
     /// Returns filesystem's private data struct (if any)
-    fn data<'a>(&'a self) -> Option<Ref<'a, dyn Any>>;
+    fn data(&self) -> Option<Ref<dyn Any>>;
 }
diff --git a/fs/vfs/src/node.rs b/fs/vfs/src/node.rs
index 352eb97..8782ff7 100644
--- a/fs/vfs/src/node.rs
+++ b/fs/vfs/src/node.rs
@@ -102,7 +102,7 @@ impl Vnode {
         })
     }
 
-    pub fn name<'a>(&'a self) -> &'a str {
+    pub fn name(&self) -> &str {
         &self.name
     }
 
diff --git a/init/src/main.rs b/init/src/main.rs
index 0035ef2..c90312c 100644
--- a/init/src/main.rs
+++ b/init/src/main.rs
@@ -5,54 +5,34 @@
 #[macro_use]
 extern crate libusr;
 
-use libusr::io;
-use libusr::sys::{OpenFlags, AT_FDCWD};
-
 #[no_mangle]
 fn main() -> i32 {
-    loop {
-        let pid = unsafe { libusr::sys::sys_fork() };
+    let mut buf = [0; 128];
 
-        if pid == 0 {
-            trace!("Hello!");
-            unsafe {
-                libusr::sys::sys_ex_nanosleep(3_000_000_000, core::ptr::null_mut());
+    print!("\x1B[2J\x1B[1;1H");
+    println!("Hello!");
+
+    loop {
+        print!("> ");
+
+        let count = unsafe {
+            libusr::sys::sys_read(0, buf.as_mut_ptr(), buf.len())
+        };
+        if count < 0 {
+            trace!("Read from stdio failed");
+            break;
+        }
+        let count = count as usize;
+
+        if let Ok(s) = core::str::from_utf8(&buf[..count]) {
+            println!("Got string {:?}", s);
+
+            if s == "quit" {
+                break;
             }
-            trace!("Exiting");
-            return 0;
         } else {
-            trace!("Spawned {}", pid);
-            unsafe {
-                libusr::sys::sys_ex_nanosleep(5_000_000_000, core::ptr::null_mut());
-            }
+            println!("Got string (non-utf8) {:?}", &buf[..count]);
         }
     }
-    //let mut buf = [0; 128];
-
-    // print!("\x1B[2J\x1B[1;1H");
-    // println!("Hello!");
-
-    // loop {
-    //     print!("> ");
-
-    //     let count = unsafe {
-    //         libusr::sys::sys_read(0, buf.as_mut_ptr(), buf.len())
-    //     };
-    //     if count < 0 {
-    //         trace!("Read from stdio failed");
-    //         break;
-    //     }
-    //     let count = count as usize;
-
-    //     if let Ok(s) = core::str::from_utf8(&buf[..count]) {
-    //         println!("Got string {:?}", s);
-
-    //         if s == "quit" {
-    //             break;
-    //         }
-    //     } else {
-    //         println!("Got string (non-utf8) {:?}", &buf[..count]);
-    //     }
-    // }
-    // -1
+    -1
 }
diff --git a/kernel/src/arch/aarch64/exception.rs b/kernel/src/arch/aarch64/exception.rs
index 607d5b4..66effb4 100644
--- a/kernel/src/arch/aarch64/exception.rs
+++ b/kernel/src/arch/aarch64/exception.rs
@@ -17,7 +17,6 @@ pub const EC_DATA_ABORT_EL0: u64 = 0b100100;
 /// SVC instruction in AA64 state
 pub const EC_SVC_AA64: u64 = 0b010101;
 
-#[allow(missing_docs)]
 #[derive(Debug)]
 #[repr(C)]
 pub struct ExceptionFrame {
@@ -89,7 +88,8 @@ extern "C" fn __aa64_exc_sync_handler(exc: &mut ExceptionFrame) {
                     match syscall::sys_fork(exc) {
                         Ok(pid) => exc.x[0] = pid.value() as usize,
                         Err(err) => {
-                            todo!()
+                            warnln!("fork() syscall failed: {:?}", err);
+                            exc.x[0] = usize::MAX;
                         },
                     }
                     return;
diff --git a/kernel/src/arch/aarch64/mach_orangepi3/mod.rs b/kernel/src/arch/aarch64/mach_orangepi3/mod.rs
index 250d143..2e707b0 100644
--- a/kernel/src/arch/aarch64/mach_orangepi3/mod.rs
+++ b/kernel/src/arch/aarch64/mach_orangepi3/mod.rs
@@ -27,7 +27,6 @@ use rtc::Rtc;
 use uart::Uart;
 use wdog::RWdog;
 
-#[allow(missing_docs)]
 pub fn init_board_early() -> Result<(), Errno> {
     unsafe {
         UART0.enable()?;
@@ -37,7 +36,6 @@ pub fn init_board_early() -> Result<(), Errno> {
     Ok(())
 }
 
-#[allow(missing_docs)]
 pub fn init_board() -> Result<(), Errno> {
     unsafe {
         GIC.enable()?;
diff --git a/kernel/src/arch/aarch64/mach_qemu/mod.rs b/kernel/src/arch/aarch64/mach_qemu/mod.rs
index 7a5197e..88d8770 100644
--- a/kernel/src/arch/aarch64/mach_qemu/mod.rs
+++ b/kernel/src/arch/aarch64/mach_qemu/mod.rs
@@ -30,7 +30,6 @@ const ECAM_BASE: usize = 0x4010000000;
 const PHYS_BASE: usize = 0x40000000;
 const PHYS_SIZE: usize = 0x10000000;
 
-#[allow(missing_docs)]
 pub fn init_board_early() -> Result<(), Errno> {
     unsafe {
         // Enable UART early on
@@ -41,7 +40,6 @@ pub fn init_board_early() -> Result<(), Errno> {
     Ok(())
 }
 
-#[allow(missing_docs)]
 pub fn init_board() -> Result<(), Errno> {
     unsafe {
         GIC.enable()?;
diff --git a/kernel/src/arch/aarch64/reg/cntkctl_el1.rs b/kernel/src/arch/aarch64/reg/cntkctl_el1.rs
index ab2221e..9b57041 100644
--- a/kernel/src/arch/aarch64/reg/cntkctl_el1.rs
+++ b/kernel/src/arch/aarch64/reg/cntkctl_el1.rs
@@ -7,7 +7,6 @@ use tock_registers::{
 
 register_bitfields! {
     u64,
-    #[allow(missing_docs)]
     /// Counter-timer Kernel Control Register
     pub CNTKCTL_EL1 [
         /// If set, disables CNTPCT and CNTFRQ trapping from EL0
diff --git a/kernel/src/arch/aarch64/reg/cpacr_el1.rs b/kernel/src/arch/aarch64/reg/cpacr_el1.rs
index 3c7077b..2f58ee4 100644
--- a/kernel/src/arch/aarch64/reg/cpacr_el1.rs
+++ b/kernel/src/arch/aarch64/reg/cpacr_el1.rs
@@ -7,7 +7,6 @@ use tock_registers::{
 
 register_bitfields! {
     u64,
-    #[allow(missing_docs)]
     /// EL1 Architectural Feature Access Control Register
     pub CPACR_EL1 [
         /// Enable EL0 and EL1 SIMD/FP accesses to EL1
diff --git a/kernel/src/config.rs b/kernel/src/config.rs
index f46a190..80ec869 100644
--- a/kernel/src/config.rs
+++ b/kernel/src/config.rs
@@ -72,7 +72,7 @@ impl Config {
         }
     }
 
-    pub fn set_cmdline(&self, cmdline: &str) {
+    pub fn set_cmdline(&self, _cmdline: &str) {
         // TODO
     }
 }
@@ -91,7 +91,7 @@ impl<const N: usize> ConfigString<N> {
 
     pub fn set_from_str(&mut self, data: &str) {
         let bytes = data.as_bytes();
-        self.buf[..bytes.len()].copy_from_slice(&bytes);
+        self.buf[..bytes.len()].copy_from_slice(bytes);
         self.len = bytes.len();
     }
 }
diff --git a/kernel/src/dev/mod.rs b/kernel/src/dev/mod.rs
index fda658b..144de1c 100644
--- a/kernel/src/dev/mod.rs
+++ b/kernel/src/dev/mod.rs
@@ -3,17 +3,14 @@
 use error::Errno;
 
 // Device classes
-#[allow(missing_docs)]
 pub mod fdt;
 pub mod gpio;
 pub mod irq;
-#[allow(missing_docs)]
 pub mod sd;
 pub mod pci;
 pub mod rtc;
 pub mod serial;
 pub mod timer;
-#[allow(missing_docs)]
 pub mod tty;
 
 /// Generic device trait
diff --git a/kernel/src/dev/pci/mod.rs b/kernel/src/dev/pci/mod.rs
index eb23cd9..6245e18 100644
--- a/kernel/src/dev/pci/mod.rs
+++ b/kernel/src/dev/pci/mod.rs
@@ -8,21 +8,18 @@ pub mod pcie;
 
 macro_rules! ecam_field {
     ($getter:ident, $off:expr, u16) => {
-        #[allow(missing_docs)]
         #[inline(always)]
         fn $getter(&self) -> u16 {
             self.readw($off)
         }
     };
     ($getter:ident, $off:expr, u8) => {
-        #[allow(missing_docs)]
         #[inline(always)]
         fn $getter(&self) -> u8 {
             self.readb($off)
         }
     };
     ($getter:ident, $setter:ident, $off:expr, u16) => {
-        #[allow(missing_docs)]
         #[inline(always)]
         unsafe fn $setter(&self, v: u16) {
             self.writew($off, v)
diff --git a/kernel/src/dev/sd.rs b/kernel/src/dev/sd.rs
index 35ab321..eb541bf 100644
--- a/kernel/src/dev/sd.rs
+++ b/kernel/src/dev/sd.rs
@@ -295,24 +295,21 @@ impl SdCardStatus {
 
 impl SdResponseType {
     pub const fn is_busy(self) -> bool {
-        match self {
-            Self::R1b | Self::R5b => true,
-            _ => false,
-        }
+        matches!(self, Self::R1b | Self::R5b)
     }
 }
 
 impl SdResponse {
     pub fn unwrap_one(&self) -> u32 {
-        match self {
-            &SdResponse::One(v) => v,
+        match *self {
+            SdResponse::One(v) => v,
             _ => panic!("Unexpected response type"),
         }
     }
 
     pub fn unwrap_four(&self) -> [u32; 4] {
-        match self {
-            &SdResponse::Four(v) => v,
+        match *self {
+            SdResponse::Four(v) => v,
             _ => panic!("Unexpected response type"),
         }
     }
@@ -343,10 +340,7 @@ impl SdCommand<'_> {
     }
 
     pub const fn is_acmd(&self) -> bool {
-        match self.number {
-            SdCommandNumber::Acmd41 | SdCommandNumber::Acmd51 => true,
-            _ => false,
-        }
+        matches!(self.number, SdCommandNumber::Acmd41 | SdCommandNumber::Acmd51)
     }
 
     pub const fn number(&self) -> u32 {
diff --git a/kernel/src/dev/tty.rs b/kernel/src/dev/tty.rs
index 7f2a636..0980887 100644
--- a/kernel/src/dev/tty.rs
+++ b/kernel/src/dev/tty.rs
@@ -3,7 +3,6 @@ use crate::proc::wait::Wait;
 use crate::sync::IrqSafeSpinLock;
 use vfs::CharDevice;
 
-#[allow(missing_docs)]
 #[derive(Debug)]
 struct CharRingInner<const N: usize> {
     rd: usize,
@@ -19,7 +18,6 @@ pub struct CharRing<const N: usize> {
     inner: IrqSafeSpinLock<CharRingInner<N>>,
 }
 
-#[allow(missing_docs)]
 impl<const N: usize> CharRingInner<N> {
     #[inline]
     const fn is_readable(&self) -> bool {
@@ -44,7 +42,6 @@ impl<const N: usize> CharRingInner<N> {
     }
 }
 
-#[allow(missing_docs)]
 impl<const N: usize> CharRing<N> {
     pub const fn new() -> Self {
         Self {
diff --git a/kernel/src/init.rs b/kernel/src/init.rs
index cef850e..c2c285d 100644
--- a/kernel/src/init.rs
+++ b/kernel/src/init.rs
@@ -3,7 +3,7 @@ use crate::fs::{devfs, MemfsBlockAlloc};
 use crate::mem;
 use crate::proc::{elf, Process};
 use memfs::Ramfs;
-use vfs::{FileMode, Filesystem, Ioctx, OpenFlags};
+use vfs::{Filesystem, Ioctx, OpenFlags};
 
 #[inline(never)]
 pub extern "C" fn init_fn(_arg: usize) -> ! {
diff --git a/kernel/src/main.rs b/kernel/src/main.rs
index f4e5c7d..38867ef 100644
--- a/kernel/src/main.rs
+++ b/kernel/src/main.rs
@@ -34,10 +34,8 @@ pub mod fs;
 pub mod mem;
 pub mod proc;
 pub mod sync;
-#[allow(missing_docs)]
 pub mod syscall;
 pub mod util;
-#[allow(missing_docs)]
 pub mod init;
 
 #[panic_handler]
diff --git a/kernel/src/mem/phys/manager.rs b/kernel/src/mem/phys/manager.rs
index 0a7301f..cf8f33f 100644
--- a/kernel/src/mem/phys/manager.rs
+++ b/kernel/src/mem/phys/manager.rs
@@ -85,10 +85,10 @@ unsafe impl Manager for SimpleManager {
 
     fn clone_page(&mut self, src: usize) -> Result<usize, Errno> {
         let src_index = self.page_index(src);
-        let src_page = &self.pages[src_index];
-        assert_eq!(src_page.refcount, 1);
-        assert!(src_page.usage != PageUsage::Available && src_page.usage != PageUsage::Reserved);
-        let dst_index = self.alloc_single_index(src_page.usage)?;
+        let src_usage = self.pages[src_index].usage;
+        assert_eq!(self.pages[src_index].refcount, 1);
+        let dst_index = self.alloc_single_index(src_usage)?;
+        assert!(src_usage != PageUsage::Available && src_usage != PageUsage::Reserved);
         let dst = (self.base_index + dst_index) * PAGE_SIZE;
         unsafe {
             memcpy(virtualize(dst) as *mut u8, virtualize(src) as *mut u8, 4096);
diff --git a/kernel/src/mem/phys/mod.rs b/kernel/src/mem/phys/mod.rs
index f38e486..4489ba6 100644
--- a/kernel/src/mem/phys/mod.rs
+++ b/kernel/src/mem/phys/mod.rs
@@ -13,8 +13,6 @@ pub use reserved::ReservedRegion;
 
 type ManagerImpl = SimpleManager;
 
-const MAX_PAGES: usize = 1024 * 1024;
-
 /// These describe what a memory page is used for
 #[derive(PartialEq, Debug, Clone, Copy)]
 pub enum PageUsage {
@@ -83,12 +81,19 @@ pub fn alloc_page(pu: PageUsage) -> Result<usize, Errno> {
 }
 
 /// Releases a single physical memory page back for further allocation.
+///
+/// # Safety
+///
+/// Unsafe: accepts arbitrary `page` arguments
 pub unsafe fn free_page(page: usize) -> Result<(), Errno> {
     MANAGER.lock().as_mut().unwrap().free_page(page)
 }
 
-pub fn clone_page(src: usize) -> Result<usize, Errno> {
-    MANAGER.lock().as_mut().unwrap().clone_page(src)
+/// # Safety
+///
+/// Unsafe: accepts arbitrary `page` arguments
+pub unsafe fn clone_page(page: usize) -> Result<usize, Errno> {
+    MANAGER.lock().as_mut().unwrap().clone_page(page)
 }
 
 fn find_contiguous<T: Iterator<Item = MemoryRegion>>(iter: T, count: usize) -> Option<usize> {
@@ -115,6 +120,11 @@ fn find_contiguous<T: Iterator<Item = MemoryRegion>>(iter: T, count: usize) -> O
 
 /// Initializes physical memory manager using an iterator of available
 /// physical memory ranges
+///
+/// # Safety
+///
+/// Unsafe: caller must ensure validity of passed memory regions.
+/// The function may not be called twice.
 pub unsafe fn init_from_iter<T: Iterator<Item = MemoryRegion> + Clone>(iter: T) {
     let mut mem_base = usize::MAX;
     for reg in iter.clone() {
@@ -157,6 +167,10 @@ pub unsafe fn init_from_iter<T: Iterator<Item = MemoryRegion> + Clone>(iter: T)
 /// Initializes physical memory manager using a single memory region.
 ///
 /// See [init_from_iter].
+///
+/// # Safety
+///
+/// Unsafe: see [init_from_iter].
 pub unsafe fn init_from_region(base: usize, size: usize) {
     let iter = SimpleMemoryIterator::new(MemoryRegion {
         start: base,
diff --git a/kernel/src/mem/virt/mod.rs b/kernel/src/mem/virt/mod.rs
index 5d4a9ec..97b8639 100644
--- a/kernel/src/mem/virt/mod.rs
+++ b/kernel/src/mem/virt/mod.rs
@@ -69,6 +69,10 @@ impl<T> DeviceMemoryIo<T> {
     /// Allocates and maps device MMIO memory.
     ///
     /// See [DeviceMemory::map]
+    ///
+    /// # Safety
+    ///
+    /// Unsafe: accepts arbitrary physical addresses
     pub unsafe fn map(name: &'static str, phys: usize, count: usize) -> Result<Self, Errno> {
         DeviceMemory::map(name, phys, count).map(Self::new)
     }
diff --git a/kernel/src/mem/virt/table.rs b/kernel/src/mem/virt/table.rs
index ab72542..7f8bbab 100644
--- a/kernel/src/mem/virt/table.rs
+++ b/kernel/src/mem/virt/table.rs
@@ -185,7 +185,7 @@ impl Space {
     }
 
     pub fn fork(&mut self) -> Result<&'static mut Self, Errno> {
-        let mut res = Self::alloc_empty()?;
+        let res = Self::alloc_empty()?;
         for l0i in 0..512 {
             if let Some(l1_table) = self.0.next_level_table(l0i) {
                 for l1i in 0..512 {
@@ -199,7 +199,7 @@ impl Space {
                                 let src_phys = unsafe { entry.address_unchecked() };
                                 let virt_addr = (l0i << 30) | (l1i << 21) | (l2i << 12);
                                 debugln!("Fork page {:#x}:{:#x}", virt_addr, src_phys);
-                                let dst_phys = phys::clone_page(src_phys)?;
+                                let dst_phys = unsafe { phys::clone_page(src_phys)? };
 
                                 res.map(virt_addr, dst_phys, unsafe { entry.fork_flags() })?;
                             }
diff --git a/kernel/src/proc/mod.rs b/kernel/src/proc/mod.rs
index cd1a838..1876305 100644
--- a/kernel/src/proc/mod.rs
+++ b/kernel/src/proc/mod.rs
@@ -1,39 +1,37 @@
 //! Process and thread manipulation facilities
 
-use crate::mem;
 use crate::init;
 use crate::sync::IrqSafeSpinLock;
-use alloc::{boxed::Box, collections::BTreeMap};
+use alloc::collections::BTreeMap;
 
 pub mod elf;
 pub mod process;
 pub use process::{Pid, Process, ProcessRef, State as ProcessState};
 
-#[allow(missing_docs)]
 pub mod wait;
 
 pub mod sched;
 pub use sched::Scheduler;
 pub(self) use sched::SCHED;
 
-macro_rules! spawn {
-    (fn ($dst_arg:ident : usize) $body:block, $src_arg:expr) => {{
-        #[inline(never)]
-        extern "C" fn __inner_func($dst_arg : usize) -> ! {
-            let __res = $body;
-            {
-                #![allow(unreachable_code)]
-                SCHED.current_process().exit(__res);
-                panic!();
-            }
-        }
-
-        let __proc = $crate::proc::Process::new_kernel(__inner_func, $src_arg).unwrap();
-        $crate::proc::SCHED.enqueue(__proc.id());
-    }};
-
-    (fn () $body:block) => (spawn!(fn (_arg: usize) $body, 0usize))
-}
+// macro_rules! spawn {
+//     (fn ($dst_arg:ident : usize) $body:block, $src_arg:expr) => {{
+//         #[inline(never)]
+//         extern "C" fn __inner_func($dst_arg : usize) -> ! {
+//             let __res = $body;
+//             {
+//                 #![allow(unreachable_code)]
+//                 SCHED.current_process().exit(__res);
+//                 panic!();
+//             }
+//         }
+//
+//         let __proc = $crate::proc::Process::new_kernel(__inner_func, $src_arg).unwrap();
+//         $crate::proc::SCHED.enqueue(__proc.id());
+//     }};
+//
+//     (fn () $body:block) => (spawn!(fn (_arg: usize) $body, 0usize))
+// }
 
 /// Performs a task switch.
 ///
diff --git a/kernel/src/proc/process.rs b/kernel/src/proc/process.rs
index cff22c0..34ebb56 100644
--- a/kernel/src/proc/process.rs
+++ b/kernel/src/proc/process.rs
@@ -181,6 +181,12 @@ impl ProcessIo {
     }
 }
 
+impl Default for ProcessIo {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Process {
     const USTACK_VIRT_TOP: usize = 0x100000000;
     const USTACK_PAGES: usize = 4;
@@ -301,7 +307,7 @@ impl Process {
             })
         });
         debugln!("Process {} forked into {}", src_inner.id, dst_id);
-        assert!(PROCESSES.lock().insert(dst_id, dst.clone()).is_none());
+        assert!(PROCESSES.lock().insert(dst_id, dst).is_none());
         SCHED.enqueue(dst_id);
 
         Ok(dst_id)
diff --git a/kernel/src/syscall.rs b/kernel/src/syscall.rs
index 91242ea..18e5458 100644
--- a/kernel/src/syscall.rs
+++ b/kernel/src/syscall.rs
@@ -55,7 +55,7 @@ fn validate_user_ptr_null<'a>(base: usize, len: usize) -> Result<Option<&'a mut
     if base == 0 {
         Ok(None)
     } else {
-        validate_user_ptr(base, len).map(|e| Some(e))
+        validate_user_ptr(base, len).map(Some)
     }
 }
 
@@ -107,13 +107,15 @@ fn validate_user_str<'a>(base: usize, limit: usize) -> Result<&'a str, Errno> {
     })
 }
 
+/// # Safety
+///
+/// Unsafe: accepts and clones process states. Only legal to call
+/// from exception handlers.
 pub unsafe fn sys_fork(regs: &mut ExceptionFrame) -> Result<Pid, Errno> {
-    let proc = Process::current();
-    let res = proc.fork(regs);
-    res
+    Process::current().fork(regs)
 }
 
-pub unsafe fn syscall(num: usize, args: &[usize]) -> Result<usize, Errno> {
+pub fn syscall(num: usize, args: &[usize]) -> Result<usize, Errno> {
     match num {
         // Process management system calls
         abi::SYS_EXIT => {
@@ -196,7 +198,7 @@ pub unsafe fn syscall(num: usize, args: &[usize]) -> Result<usize, Errno> {
             let res = wait::sleep(Duration::from_nanos(args[0] as u64), &mut rem);
             if res == Err(Errno::Interrupt) {
                 warnln!("Sleep interrupted, {:?} remaining", rem);
-                if let Some(_) = rem_buf {
+                if rem_buf.is_some() {
                     todo!()
                 }
             }
diff --git a/syscall/src/stat.rs b/syscall/src/stat.rs
index 09c2e20..70b0d01 100644
--- a/syscall/src/stat.rs
+++ b/syscall/src/stat.rs
@@ -1,12 +1,10 @@
-use core::fmt;
-
 pub const AT_FDCWD: i32 = -2;
 
 bitflags! {
     pub struct OpenFlags: u32 {
-        const O_RDONLY =    1 << 0;
-        const O_WRONLY =    2 << 0;
-        const O_RDWR =      3 << 0;
+        const O_RDONLY =    1;
+        const O_WRONLY =    2;
+        const O_RDWR =      3;
         const O_ACCESS =    0xF;
 
         const O_CREAT =     1 << 4;