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-rw-r--r--include/linux/rmap.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index bf97b090001..db2c1df4fef 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -103,6 +103,14 @@ pte_t *page_check_address(struct page *, struct mm_struct *,
*/
unsigned long page_address_in_vma(struct page *, struct vm_area_struct *);
+/*
+ * Cleans the PTEs of shared mappings.
+ * (and since clean PTEs should also be readonly, write protects them too)
+ *
+ * returns the number of cleaned PTEs.
+ */
+int page_mkclean(struct page *);
+
#else /* !CONFIG_MMU */
#define anon_vma_init() do {} while (0)
@@ -112,6 +120,12 @@ unsigned long page_address_in_vma(struct page *, struct vm_area_struct *);
#define page_referenced(page,l) TestClearPageReferenced(page)
#define try_to_unmap(page, refs) SWAP_FAIL
+static inline int page_mkclean(struct page *page)
+{
+ return 0;
+}
+
+
#endif /* CONFIG_MMU */
/*