fs/proc/vmcore: factor out freeing a list of vmcore ranges

Let's factor it out into include/linux/crash_dump.h, from where we can
use it also outside of vmcore.c later.

Acked-by: Baoquan He <[email protected]>
Signed-off-by: David Hildenbrand <[email protected]>
Message-Id: <[email protected]>
Acked-by: Andrew Morton <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>

Author: davidhildenbrand

fs/proc/vmcore.c

@@ -1592,14 +1592,7 @@ void vmcore_cleanup(void)
 		proc_vmcore = NULL;
 	}
 
-	/* clear the vmcore list. */
-	while (!list_empty(&vmcore_list)) {
-		struct vmcore_range *m;
-
-		m = list_first_entry(&vmcore_list, struct vmcore_range, list);
-		list_del(&m->list);
-		kfree(m);
-	}
+	vmcore_free_ranges(&vmcore_list);
 	free_elfcorebuf();
 
 	/* clear vmcore device dump list */

include/linux/crash_dump.h

@@ -135,6 +135,17 @@ static inline int vmcore_alloc_add_range(struct list_head *list,
 	return 0;
 }
 
+/* Free a list of vmcore ranges. */
+static inline void vmcore_free_ranges(struct list_head *list)
+{
+	struct vmcore_range *m, *tmp;
+
+	list_for_each_entry_safe(m, tmp, list, list) {
+		list_del(&m->list);
+		kfree(m);
+	}
+}
+
 #else /* !CONFIG_CRASH_DUMP */
 static inline bool is_kdump_kernel(void) { return false; }
 #endif /* CONFIG_CRASH_DUMP */