136  * Return true if we can merge this (vm_flags,anon_vma,file,vm_pgoff)
139  * We cannot merge two vmas if they have differently assigned (non-NULL)
146  * We assume the vma may be removed as part of the merge.
162  * Return true if we can merge this (vm_flags,anon_vma,file,vm_pgoff)
165  * We cannot merge two vmas if they have differently assigned (non-NULL)
168  * We assume that vma is not removed as part of the merge.
351  * In addition, if we can merge with the left VMA, ensure that left and right
365 	 * If we can merge with prev (left) and next (right), indicating that  in can_vma_merge_right()
632 /* Actually perform the VMA merge operation. */
686  * vma_merge_existing_range - Attempt to merge VMAs based on a VMA having its
698  * this, as well as any VMAs shrunk/expanded/deleted as a result of this merge.
700  * As part of this operation, if a merge occurs, the @vmg object will have its
701  * vma, start, end, and pgoff fields modified to execute the merge. Subsequent
704  * Returns: The merged VMA if merge succeeds, or NULL otherwise.
772 	else if (!merge_right)	/* If we have nothing to merge, abort. */  in vma_merge_existing_range()
776 	/* If we span the entire VMA, a merge implies it will be deleted. */  in vma_merge_existing_range()
781 	 * we have no sensible recourse but to abort the merge.  in vma_merge_existing_range()
787 	 * If we merge both VMAs, then next is also deleted. This implies  in vma_merge_existing_range()
922  * vma_merge_new_range - Attempt to merge a new VMA into address space
925  *       (exclusive), which we try to merge with any adjacent VMAs if possible.
945  *    VMAs do not have identical attributes - NO MERGE POSSIBLE.
947  * In instances where we can merge, this function returns the expanded VMA which
951  * Returns: In instances where no merge was possible, NULL. Otherwise, a pointer
987 	/* If we can merge with the next VMA, adjust vmg accordingly. */  in vma_merge_new_range()
993 	/* If we can merge with the previous VMA, adjust vmg accordingly. */  in vma_merge_new_range()
1000 		 * If this merge would result in removal of the next VMA but we  in vma_merge_new_range()
1034  * vmg->next->vm_end.  Checking if the vmg->vma can expand and merge with
1499  * As a result, we might be able to merge the newly modified VMA range with an
1502  * If no merge is possible and the range does not span the entirety of the VMA,
1513 	/* First, try to merge. */  in vma_modify()
1745 			 * the merge to happen. mremap must change the  in copy_vma()
1797  * we can merge the two vma's. For example, we refuse to merge a vma if
1819  * by another page fault trying to merge _that_. But that's ok: if it
1851  * anon_vmas being allocated, preventing vma merge in subsequent
2377 	 * call covers the non-merge case.  in __mmap_new_vma()
2447 	/* Attempt to merge with adjacent VMAs... */  in __mmap_region()
2461 	/* If flags changed, we might be able to merge, so try again. */  in __mmap_region()