Rust-for-Linux: Custom alloc, using stable Rust compilers, and more

        for _ in 0..page_count {
            let page = Pages::<0>::new()?;
            page.insert_page(vma, address)?;
-            pages.push(page);
+            pages.try_push(page)?;
            address += 1 << bindings::PAGE_SHIFT;
        }

-        // TODO: This allocates memory.
-        let arc = Arc::from(pages);
+        let arc = Arc::try_from_vec(pages)?;

        // Save pages for later.
        let mut inner = self.inner.lock();

    fn read_all(&mut self) -> Result<Vec<u8>> {
        let mut data = Vec::<u8>::new();
-        data.try_reserve_exact(self.len())?;
-        data.resize(self.len(), 0);
+        data.try_resize(self.len(), 0)?;

        // SAFETY: The output buffer is valid as we just allocated it.
        unsafe { self.read_raw(data.as_mut_ptr(), data.len())? };