* be processed until returning to user space.
*/
if (unlikely(test_tsk_thread_flag(tsk, TIF_MEMDIE)))
- return -ENOMEM;
+ return i ? i : -ENOMEM;
if (write)
foll_flags |= FOLL_WRITE;
struct page *dirty_page = NULL;
old_page = vm_normal_page(vma, address, orig_pte);
- if (!old_page)
+ if (!old_page) {
+ /*
+ * VM_MIXEDMAP !pfn_valid() case
+ *
+ * We should not cow pages in a shared writeable mapping.
+ * Just mark the pages writable as we can't do any dirty
+ * accounting on raw pfn maps.
+ */
+ if ((vma->vm_flags & (VM_WRITE|VM_SHARED)) ==
+ (VM_WRITE|VM_SHARED))
+ goto reuse;
goto gotten;
+ }
/*
* Take out anonymous pages first, anonymous shared vmas are
}
if (reuse) {
+reuse:
flush_cache_page(vma, address, pte_pfn(orig_pte));
entry = pte_mkyoung(orig_pte);
entry = maybe_mkwrite(pte_mkdirty(entry), vma);