- switch (__handle_mm_fault(mm, vma, start,
- write_access)) {
- case VM_FAULT_WRITE:
- /*
- * do_wp_page has broken COW when
- * necessary, even if maybe_mkwrite
- * decided not to set pte_write
- */
+ ret = __handle_mm_fault(mm, vma, start, write_access);
+
+ /*
+ * The VM_FAULT_WRITE bit tells us that do_wp_page has
+ * broken COW when necessary, even if maybe_mkwrite
+ * decided not to set pte_write. We can thus safely do
+ * subsequent page lookups as if they were reads.
+ */
+ if (ret & VM_FAULT_WRITE)