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-rw-r--r--mm/mprotect.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index c1d6af7455da..625608bc8962 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -27,6 +27,7 @@
#include <linux/pkeys.h>
#include <linux/ksm.h>
#include <linux/uaccess.h>
+#include <linux/mm_inline.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
@@ -89,6 +90,14 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
page_mapcount(page) != 1)
continue;
+ /*
+ * While migration can move some dirty pages,
+ * it cannot move them all from MIGRATE_ASYNC
+ * context.
+ */
+ if (page_is_file_cache(page) && PageDirty(page))
+ continue;
+
/* Avoid TLB flush if possible */
if (pte_protnone(oldpte))
continue;