list: include linux/kernel.h

linux/list.h uses container_of, therefore it depends on linux/kernel.h.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/list.h

@@ -5,6 +5,7 @@
 #include <linux/stddef.h>
 #include <linux/poison.h>
 #include <linux/const.h>
+#include <linux/kernel.h>
 
 /*
  * Simple doubly linked list implementation.