docs: rename Documentation/vm to Documentation/mm

so it will be consistent with code mm directory and with
Documentation/admin-guide/mm and won't be confused with virtual machines.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Tested-by: Ira Weiny <ira.weiny@intel.com>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Acked-by: Wu XiangCheng <bobwxc@email.cn>

include/linux/hmm.h

@@ -4,7 +4,7 @@
  *
  * Authors: Jérôme Glisse <jglisse@redhat.com>
  *
- * See Documentation/vm/hmm.rst for reasons and overview of what HMM is.
+ * See Documentation/mm/hmm.rst for reasons and overview of what HMM is.
  */
 #ifndef LINUX_HMM_H
 #define LINUX_HMM_H
@@ -100,7 +100,7 @@ struct hmm_range {
 };
 
 /*
- * Please see Documentation/vm/hmm.rst for how to use the range API.
+ * Please see Documentation/mm/hmm.rst for how to use the range API.
  */
 int hmm_range_fault(struct hmm_range *range);
 

include/linux/memremap.h

@@ -39,7 +39,7 @@ struct vmem_altmap {
  * must be treated as an opaque object, rather than a "normal" struct page.
  *
  * A more complete discussion of unaddressable memory may be found in
- * include/linux/hmm.h and Documentation/vm/hmm.rst.
+ * include/linux/hmm.h and Documentation/mm/hmm.rst.
  *
  * MEMORY_DEVICE_FS_DAX:
  * Host memory that has similar access semantics as System RAM i.e. DMA

include/linux/mmu_notifier.h

@@ -198,7 +198,7 @@ struct mmu_notifier_ops {
 	 * invalidate_range_start()/end() notifiers, as
 	 * invalidate_range() already catches the points in time when an
 	 * external TLB range needs to be flushed. For more in depth
-	 * discussion on this see Documentation/vm/mmu_notifier.rst
+	 * discussion on this see Documentation/mm/mmu_notifier.rst
 	 *
 	 * Note that this function might be called with just a sub-range
 	 * of what was passed to invalidate_range_start()/end(), if

include/linux/sched/mm.h

@@ -29,7 +29,7 @@ extern struct mm_struct *mm_alloc(void);
  *
  * Use mmdrop() to release the reference acquired by mmgrab().
  *
- * See also <Documentation/vm/active_mm.rst> for an in-depth explanation
+ * See also <Documentation/mm/active_mm.rst> for an in-depth explanation
  * of &mm_struct.mm_count vs &mm_struct.mm_users.
  */
 static inline void mmgrab(struct mm_struct *mm)
@@ -92,7 +92,7 @@ static inline void mmdrop_sched(struct mm_struct *mm)
  *
  * Use mmput() to release the reference acquired by mmget().
  *
- * See also <Documentation/vm/active_mm.rst> for an in-depth explanation
+ * See also <Documentation/mm/active_mm.rst> for an in-depth explanation
  * of &mm_struct.mm_count vs &mm_struct.mm_users.
  */
 static inline void mmget(struct mm_struct *mm)

include/linux/swap.h

@@ -74,7 +74,7 @@ static inline int current_is_kswapd(void)
 
 /*
  * Unaddressable device memory support. See include/linux/hmm.h and
- * Documentation/vm/hmm.rst. Short description is we need struct pages for
+ * Documentation/mm/hmm.rst. Short description is we need struct pages for
  * device memory that is unaddressable (inaccessible) by CPU, so that we can
  * migrate part of a process memory to device memory.
  *