Merge branch 'for-3.15-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

Pull a percpu fix from Tejun Heo:
 "Fix for a percpu allocator bug where it could try to kfree() a memory
  region allocated using vmalloc().  The bug has been there for years
  now and is unlikely to have ever triggered given the size of struct
  pcpu_chunk.  It's still theoretically possible and the fix is simple
  and safe enough, so the patch is marked with -stable"

* 'for-3.15-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu: make pcpu_alloc_chunk() use pcpu_mem_free() instead of kfree()

Author: torvalds

mm/percpu.c

@@ -610,7 +610,7 @@ static struct pcpu_chunk *pcpu_alloc_chunk(void)
 	chunk->map = pcpu_mem_zalloc(PCPU_DFL_MAP_ALLOC *
 						sizeof(chunk->map[0]));
 	if (!chunk->map) {
-		kfree(chunk);
+		pcpu_mem_free(chunk, pcpu_chunk_struct_size);
 		return NULL;
 	}