1 files changed, 3 insertions, 0 deletions

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 44727811bf4c..88584838e704 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -75,6 +75,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
                 oldpte = *pte;
                 if (pte_present(oldpte)) {
                         pte_t ptent;
+                        bool preserve_write = prot_numa && pte_write(oldpte);
 
                         /*
                          * Avoid trapping faults against the zero or KSM
@@ -94,6 +95,8 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 
                         ptent = ptep_modify_prot_start(mm, addr, pte);
                         ptent = pte_modify(ptent, newprot);
+                        if (preserve_write)
+                                ptent = pte_mkwrite(ptent);
 
                         /* Avoid taking write faults for known dirty pages */
                         if (dirty_accountable && pte_dirty(ptent) &&