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-rw-r--r--mm/mmap.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index ffd6c6c9bcf..22dff49d579 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -657,9 +657,6 @@ 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.
@@ -667,7 +664,8 @@ 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;