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-rw-r--r--mm/memory.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 3666a4c..d1f46f4 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1812,7 +1812,16 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
spinlock_t *ptl;
pte_t entry;
- if (write_access) {
+ /*
+ * A VM_UNPAGED vma will normally be filled with present ptes
+ * by remap_pfn_range, and never arrive here; but it might have
+ * holes, or if !VM_DONTEXPAND, mremap might have expanded it.
+ * It's weird enough handling anon pages in unpaged vmas, we do
+ * not want to worry about ZERO_PAGEs too (it may or may not
+ * matter if their counts wrap): just give them anon pages.
+ */
+
+ if (write_access || (vma->vm_flags & VM_UNPAGED)) {
/* Allocate our own private page. */
pte_unmap(page_table);
@@ -1887,6 +1896,7 @@ static int do_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
int anon = 0;
pte_unmap(page_table);
+ BUG_ON(vma->vm_flags & VM_UNPAGED);
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;
@@ -1962,7 +1972,7 @@ retry:
inc_mm_counter(mm, anon_rss);
lru_cache_add_active(new_page);
page_add_anon_rmap(new_page, vma, address);
- } else if (!(vma->vm_flags & VM_UNPAGED)) {
+ } else {
inc_mm_counter(mm, file_rss);
page_add_file_rmap(new_page);
}
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