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Diffstat (limited to 'mm/rmap.c')
-rw-r--r--mm/rmap.c38
1 files changed, 24 insertions, 14 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index 10806b7af40..3b8ce86daa3 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -103,7 +103,7 @@ int anon_vma_prepare(struct vm_area_struct *vma)
spin_lock(&mm->page_table_lock);
if (likely(!vma->anon_vma)) {
vma->anon_vma = anon_vma;
- list_add(&vma->anon_vma_node, &anon_vma->head);
+ list_add_tail(&vma->anon_vma_node, &anon_vma->head);
allocated = NULL;
}
spin_unlock(&mm->page_table_lock);
@@ -127,7 +127,7 @@ void __anon_vma_link(struct vm_area_struct *vma)
struct anon_vma *anon_vma = vma->anon_vma;
if (anon_vma) {
- list_add(&vma->anon_vma_node, &anon_vma->head);
+ list_add_tail(&vma->anon_vma_node, &anon_vma->head);
validate_anon_vma(vma);
}
}
@@ -138,7 +138,7 @@ void anon_vma_link(struct vm_area_struct *vma)
if (anon_vma) {
spin_lock(&anon_vma->lock);
- list_add(&vma->anon_vma_node, &anon_vma->head);
+ list_add_tail(&vma->anon_vma_node, &anon_vma->head);
validate_anon_vma(vma);
spin_unlock(&anon_vma->lock);
}
@@ -620,17 +620,27 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
if (PageAnon(page)) {
swp_entry_t entry = { .val = page_private(page) };
- /*
- * Store the swap location in the pte.
- * See handle_pte_fault() ...
- */
- BUG_ON(!PageSwapCache(page));
- swap_duplicate(entry);
- if (list_empty(&mm->mmlist)) {
- spin_lock(&mmlist_lock);
- if (list_empty(&mm->mmlist))
- list_add(&mm->mmlist, &init_mm.mmlist);
- spin_unlock(&mmlist_lock);
+
+ if (PageSwapCache(page)) {
+ /*
+ * Store the swap location in the pte.
+ * See handle_pte_fault() ...
+ */
+ swap_duplicate(entry);
+ if (list_empty(&mm->mmlist)) {
+ spin_lock(&mmlist_lock);
+ if (list_empty(&mm->mmlist))
+ list_add(&mm->mmlist, &init_mm.mmlist);
+ spin_unlock(&mmlist_lock);
+ }
+ } else {
+ /*
+ * Store the pfn of the page in a special migration
+ * pte. do_swap_page() will wait until the migration
+ * pte is removed and then restart fault handling.
+ */
+ BUG_ON(!migration);
+ entry = make_migration_entry(page, pte_write(pteval));
}
set_pte_at(mm, address, pte, swp_entry_to_pte(entry));
BUG_ON(pte_file(*pte));