[PATCH 4.19 39/93] mm/zsmalloc.c: fix build when CONFIG_COMPACTION=n

[Greg Kroah-Hartman]

From: Andrew Morton <a...@linux-foundation.org>

commit 441e254cd40dc03beec3c650ce6ce6074bc6517f upstream.

Fixes: 701d678599d0c1 ("mm/zsmalloc.c: fix race condition in zs_destroy_pool")
Link: http://lkml.kernel.org/r/201908251039.5osbeeut%25...@intel.com
Reported-by: kbuild test robot <l...@intel.com>
Cc: Sergey Senozhatsky <sergey.senozhat...@gmail.com>
Cc: Henry Burns <henrywolfebu...@gmail.com>
Cc: Minchan Kim <minc...@kernel.org>
Cc: Shakeel Butt <shake...@google.com>
Cc: Jonathan Adams <jwad...@google.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 mm/zsmalloc.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -2432,7 +2432,9 @@ struct zs_pool *zs_create_pool(const cha
        if (!pool->name)
                goto err;
 
+#ifdef CONFIG_COMPACTION
        init_waitqueue_head(&pool->migration_wait);
+#endif
 
        if (create_cache(pool))
                goto err;