[PATCH net-next] net/rds: Add missing include file

[YueHaibing]

Fix build error:

net/rds/ib_cm.c: In function rds_dma_hdrs_alloc:
net/rds/ib_cm.c:475:13: error: implicit declaration of function dma_pool_zalloc; did you mean mempool_alloc? [-Werror=implicit-function-declaration]
   hdrs[i] = dma_pool_zalloc(pool, GFP_KERNEL, &hdr_daddrs[i]);
             ^~~~~~~~~~~~~~~
             mempool_alloc

net/rds/ib.c: In function rds_ib_dev_free:
net/rds/ib.c:111:3: error: implicit declaration of function dma_pool_destroy; did you mean mempool_destroy? [-Werror=implicit-function-declaration]
   dma_pool_destroy(rds_ibdev->rid_hdrs_pool);
   ^~~~~~~~~~~~~~~~
   mempool_destroy

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 9b17f5884be4 ("net/rds: Use DMA memory pool allocation for rds_header")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 net/rds/ib.c    | 1 +
 net/rds/ib_cm.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/net/rds/ib.c b/net/rds/ib.c
index 23a2ae53f231..62d4ebeb08c1 100644
--- a/net/rds/ib.c
+++ b/net/rds/ib.c
@@ -30,6 +30,7 @@
  * SOFTWARE.
  *
  */
+#include <linux/dmapool.h>
 #include <linux/kernel.h>
 #include <linux/in.h>
 #include <linux/if.h>
diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c
index d08251f4a00c..6b345c858dba 100644
--- a/net/rds/ib_cm.c
+++ b/net/rds/ib_cm.c
@@ -30,6 +30,7 @@
  * SOFTWARE.
  *
  */
+#include <linux/dmapool.h>
 #include <linux/kernel.h>
 #include <linux/in.h>
 #include <linux/slab.h>
-- 
2.20.1