diff --git a/src/call.rs b/src/call.rs
index bc1af0dc20..32f266ce11 100644
--- a/src/call.rs
+++ b/src/call.rs
@@ -264,16 +264,6 @@ pub unsafe fn physmap(physical_address: usize, size: usize, flags: PhysmapFlags)
     syscall3(SYS_PHYSMAP, physical_address, size, flags.bits())
 }
 
-/// Unmap previously mapped physical memory
-///
-/// # Errors
-///
-/// * `EPERM` - `uid != 0`
-/// * `EFAULT` - `virtual_address` has not been mapped
-pub unsafe fn physunmap(virtual_address: usize) -> Result<usize> {
-    syscall1(SYS_PHYSUNMAP, virtual_address)
-}
-
 /// Create a pair of file descriptors referencing the read and write ends of a pipe
 pub fn pipe2(fds: &mut [usize; 2], flags: usize) -> Result<usize> {
     unsafe { syscall2(SYS_PIPE2, fds.as_ptr() as usize, flags) }
diff --git a/src/data.rs b/src/data.rs
index 45d2dd8625..3afb8bb603 100644
--- a/src/data.rs
+++ b/src/data.rs
@@ -149,6 +149,24 @@ pub struct SigAction {
     pub sa_mask: [u64; 2],
     pub sa_flags: SigActionFlags,
 }
+impl Deref for SigAction {
+    type Target = [u8];
+    fn deref(&self) -> &[u8] {
+        unsafe {
+            slice::from_raw_parts(self as *const SigAction as *const u8,
+                                  mem::size_of::<SigAction>())
+        }
+    }
+}
+
+impl DerefMut for SigAction {
+    fn deref_mut(&mut self) -> &mut [u8] {
+        unsafe {
+            slice::from_raw_parts_mut(self as *mut SigAction as *mut u8,
+                                      mem::size_of::<SigAction>())
+        }
+    }
+}
 
 #[allow(dead_code)]
 unsafe fn _assert_size_of_function_is_sane() {
diff --git a/src/number.rs b/src/number.rs
index 2b9205a269..cb8471f257 100644
--- a/src/number.rs
+++ b/src/number.rs
@@ -58,7 +58,6 @@ pub const SYS_PHYSALLOC: usize =945;
 pub const SYS_PHYSALLOC3: usize=9453;
 pub const SYS_PHYSFREE: usize = 946;
 pub const SYS_PHYSMAP: usize =  947;
-pub const SYS_PHYSUNMAP: usize =948;
 pub const SYS_VIRTTOPHYS: usize=949;
 pub const SYS_PIPE2: usize =    331;
 pub const SYS_SETPGID: usize =  57;