proc: much faster /proc/vmstat

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

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 063bbed..ec91dfd 100644 (file)
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -304,6 +304,7 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
                           vma->vm_userfaultfd_ctx);
        if (*pprev) {
                vma = *pprev;
+               VM_WARN_ON((vma->vm_flags ^ newflags) & ~VM_SOFTDIRTY);
                goto success;
        }