Merge branch 'for-4.19-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu

Dennis writes:
  "percpu fixes for-4.19-rc8

   The new percpu allocator introduced in 4.14 had a missing free for
   the percpu metadata. This caused a memory leak when percpu memory is
   being churned resulting in the allocation and deallocation of percpu
   memory chunks"

* 'for-4.19-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
  percpu: stop leaking bitmap metadata blocks

mm/percpu.c

@@ -1212,6 +1212,7 @@ static void pcpu_free_chunk(struct pcpu_chunk *chunk)
 {
 	if (!chunk)
 		return;
+	pcpu_mem_free(chunk->md_blocks);
 	pcpu_mem_free(chunk->bound_map);
 	pcpu_mem_free(chunk->alloc_map);
 	pcpu_mem_free(chunk);