mm: Add mm_uninitialize to release the resource

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

fs/procfs/fs_procfsmeminfo.c

@@ -582,4 +582,28 @@ void procfs_register_meminfo(FAR struct procfs_meminfo_entry_s *entry)
   g_procfs_meminfo = entry;
 }
 
+/****************************************************************************
+ * Name: procfs_unregister_meminfo
+ *
+ * Description:
+ *   Remove a meminfo entry from the procfs file system.
+ *
+ * Input Parameters:
+ *   entry - Describes the entry to be unregistered.
+ *
+ ****************************************************************************/
+
+void procfs_unregister_meminfo(FAR struct procfs_meminfo_entry_s *entry)
+{
+  FAR struct procfs_meminfo_entry_s **cur;
+
+  for (cur = &g_procfs_meminfo; *cur != NULL; cur = &(*cur)->next)
+    {
+      if (*cur == entry)
+        {
+          *cur = entry->next;
+          break;
+        }
+    }
+}
 #endif /* !CONFIG_FS_PROCFS_EXCLUDE_MEMINFO */

include/nuttx/fs/procfs.h

@@ -256,6 +256,19 @@ int procfs_register(FAR const struct procfs_entry_s *entry);
 
 void procfs_register_meminfo(FAR struct procfs_meminfo_entry_s *entry);
 
+/****************************************************************************
+ * Name: procfs_unregister_meminfo
+ *
+ * Description:
+ *   Remove a meminfo entry from the procfs file system.
+ *
+ * Input Parameters:
+ *   entry - Describes the entry to be unregistered.
+ *
+ ****************************************************************************/
+
+void procfs_unregister_meminfo(FAR struct procfs_meminfo_entry_s *entry);
+
 #undef EXTERN
 #ifdef __cplusplus
 }

include/nuttx/mm/mm.h

@@ -156,6 +156,7 @@ FAR struct mm_heap_s *mm_initialize(FAR const char *name,
                                     FAR void *heap_start, size_t heap_size);
 void mm_addregion(FAR struct mm_heap_s *heap, FAR void *heapstart,
                   size_t heapsize);
+void mm_uninitialize(FAR struct mm_heap_s *heap);
 
 /* Functions contained in umm_initialize.c **********************************/
 

mm/mm_heap/mm.h

@@ -251,6 +251,7 @@ typedef CODE void (*mmchunk_handler_t)(FAR struct mm_allocnode_s *node,
 /* Functions contained in mm_sem.c ******************************************/
 
 void mm_seminitialize(FAR struct mm_heap_s *heap);
+void mm_semuninitialize(FAR struct mm_heap_s *heap);
 bool mm_takesemaphore(FAR struct mm_heap_s *heap);
 void mm_givesemaphore(FAR struct mm_heap_s *heap);
 

mm/mm_heap/mm_initialize.c

@@ -217,24 +217,48 @@ FAR struct mm_heap_s *mm_initialize(FAR const char *name,
   mm_seminitialize(heap);
 
 #if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO)
-#if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
+#  if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
   heap->mm_procfs.name = name;
   heap->mm_procfs.heap = heap;
-#if defined (CONFIG_DEBUG_MM) && defined(CONFIG_MM_BACKTRACE_DEFAULT)
+#    if defined (CONFIG_DEBUG_MM) && defined(CONFIG_MM_BACKTRACE_DEFAULT)
   heap->mm_procfs.backtrace = true;
-#endif
-#endif
+#    endif
+#  endif
 #endif
 
   /* Add the initial region of memory to the heap */
 
   mm_addregion(heap, heapstart, heapsize);
 
 #if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO)
-#if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
+#  if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
   procfs_register_meminfo(&heap->mm_procfs);
-#endif
+#  endif
 #endif
 
   return heap;
 }
+
+/****************************************************************************
+ * Name: mm_uninitialize
+ *
+ * Description:
+ *   Uninitialize the selected heap data structures.
+ *
+ * Input Parameters:
+ *   heap - The heap to uninitialize
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void mm_uninitialize(FAR struct mm_heap_s *heap)
+{
+#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO)
+#  if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
+  procfs_unregister_meminfo(&heap->mm_procfs);
+#  endif
+#endif
+  mm_semuninitialize(heap);
+}

mm/mm_heap/mm_sem.c

@@ -56,6 +56,21 @@ void mm_seminitialize(FAR struct mm_heap_s *heap)
   _SEM_INIT(&heap->mm_semaphore, 0, 1);
 }
 
+/****************************************************************************
+ * Name: mm_seminitialize
+ *
+ * Description:
+ *   Uninitialize the MM mutex
+ *
+ ****************************************************************************/
+
+void mm_semuninitialize(FAR struct mm_heap_s *heap)
+{
+  /* Uninitialize the MM semaphore */
+
+  _SEM_DESTROY(&heap->mm_semaphore);
+}
+
 /****************************************************************************
  * Name: mm_takesemaphore
  *