rhashtable: Fix undeclared EEXIST build error on ia64
We need to include linux/errno.h in rhashtable.h since it doesn't
always get included otherwise.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h
index c3034de..89d1022 100644
--- a/include/linux/rhashtable.h
+++ b/include/linux/rhashtable.h
@@ -18,6 +18,7 @@
#define _LINUX_RHASHTABLE_H
#include <linux/compiler.h>
+#include <linux/errno.h>
#include <linux/list_nulls.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>