mm: FOLL flags for GUP flags

[linux-block.git] / mm / mmap.c

diff --git a/mm/mmap.c b/mm/mmap.c
index 376492ed08f4a66cbc782171cc0924adb1287018..6eed98c0054357187b3716733ef7dd2ef8a04af1 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -656,9 +656,6 @@ again:                      remove_next = 1 + (end > next->vm_end);
        validate_mm(mm);
 }
 
-/* Flags that can be inherited from an existing mapping when merging */
-#define VM_MERGEABLE_FLAGS (VM_CAN_NONLINEAR)
-
 /*
  * If the vma has a ->close operation then the driver probably needs to release
  * per-vma resources, so we don't attempt to merge those.
@@ -666,7 +663,8 @@ again:                      remove_next = 1 + (end > next->vm_end);
 static inline int is_mergeable_vma(struct vm_area_struct *vma,
                        struct file *file, unsigned long vm_flags)
 {
-       if ((vma->vm_flags ^ vm_flags) & ~VM_MERGEABLE_FLAGS)
+       /* VM_CAN_NONLINEAR may get set later by f_op->mmap() */
+       if ((vma->vm_flags ^ vm_flags) & ~VM_CAN_NONLINEAR)
                return 0;
        if (vma->vm_file != file)
                return 0;
@@ -2111,6 +2109,7 @@ void exit_mmap(struct mm_struct *mm)
        /* Use -1 here to ensure all VMAs in the mm are unmapped */
        end = unmap_vmas(&tlb, vma, 0, -1, &nr_accounted, NULL);
        vm_unacct_memory(nr_accounted);
+
        free_pgtables(tlb, vma, FIRST_USER_ADDRESS, 0);
        tlb_finish_mmu(tlb, 0, end);