ANDROID: 16K: rust: ashmem: __page_align VMA size check

In page-compat mode, all VMAs are forced to be a multiple of
the emulated page-size.

Bug: 414665621
Bug: 383389337
Change-Id: Idda8600616572f59a36c7150f412ec083010a8eb
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>

drivers/staging/android/ashmem_rust.rs

@@ -24,6 +24,7 @@ use kernel::{
     miscdevice::{loff_t, IovIter, Kiocb, MiscDevice, MiscDeviceOptions, MiscDeviceRegistration},
     mm::virt::{flags as vma_flags, VmAreaNew},
     page::{page_align, PAGE_MASK, PAGE_SIZE},
+    page_size_compat::__page_align,
     prelude::*,
     seq_file::{seq_print, SeqFile},
     sync::{new_mutex, Mutex, UniqueArc},
@@ -161,7 +162,7 @@ impl MiscDevice for Ashmem {
         }
 
         // Requested mapping size larger than object size.
-        if vma.end() - vma.start() > page_align(asma.size) {
+        if vma.end() - vma.start() > __page_align(asma.size) {
             return Err(EINVAL);
         }