mm: numa: add paranoid check around pte_protnone_numa

[cascardo/linux.git] / mm / huge_memory.c

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 8e791a3..8e07342 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1262,6 +1262,9 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
        bool migrated = false;
        int flags = 0;
 
+       /* A PROT_NONE fault should not end up here */
+       BUG_ON(!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)));
+
        ptl = pmd_lock(mm, pmdp);
        if (unlikely(!pmd_same(pmd, *pmdp)))
                goto out_unlock;