Always check shootdown reqs when locking addrsp.

src/syscall/driver.rs

@@ -52,7 +52,7 @@ pub fn virttophys(virtual_address: usize) -> Result<usize> {
     enforce_root()?;
 
     let addr_space = Arc::clone(context::current()?.read().addr_space()?);
-    let addr_space = addr_space.inner.read();
+    let addr_space = addr_space.acquire_read();
 
     match addr_space
         .table

src/syscall/futex.rs

@@ -53,7 +53,7 @@ pub fn futex(addr: usize, op: usize, val: usize, val2: usize, addr2: usize) -> R
 
     // Keep the address space locked so we can safely read from the physical address. Unlock it
     // before context switching.
-    let addr_space_guard = addr_space_lock.inner.read();
+    let addr_space_guard = addr_space_lock.acquire_read();
 
     let target_physaddr =
         validate_and_translate_virt(&*addr_space_guard, VirtualAddress::new(addr))

src/syscall/process.rs

@@ -587,7 +587,7 @@ pub unsafe fn usermode_bootstrap(bootstrap: &Bootstrap) -> ! {
         let page_count = NonZeroUsize::new(bootstrap.page_count)
             .expect("bootstrap contained no pages!");
 
-        let _base_page = addr_space.inner.write().mmap(&addr_space, Some(base), page_count, flags, &mut Vec::new(), |page, flags, mapper, flusher| {
+        let _base_page = addr_space.acquire_write().mmap(&addr_space, Some(base), page_count, flags, &mut Vec::new(), |page, flags, mapper, flusher| {
             let shared = false;
             Ok(Grant::zeroed(PageSpan::new(page, bootstrap.page_count), flags, mapper, flusher, shared)?)
         });