rds: use DIV_ROUND_UP instead of ceil

Yes indeed, DIV_ROUND_UP is in kernel.h.
Signed-off-by: NJacob Wen <jian.w.wen@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/rds/ib_send.c

@@ -522,7 +522,7 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 	if (be32_to_cpu(rm->m_inc.i_hdr.h_len) == 0)
 		i = 1;
 	else
-		i = ceil(be32_to_cpu(rm->m_inc.i_hdr.h_len), RDS_FRAG_SIZE);
+		i = DIV_ROUND_UP(be32_to_cpu(rm->m_inc.i_hdr.h_len), RDS_FRAG_SIZE);
 
 	work_alloc = rds_ib_ring_alloc(&ic->i_send_ring, i, &pos);
 	if (work_alloc == 0) {
@@ -879,7 +879,7 @@ int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op)
 	 * Instead of knowing how to return a partial rdma read/write we insist that there
 	 * be enough work requests to send the entire message.
 	 */
-	i = ceil(op->op_count, max_sge);
+	i = DIV_ROUND_UP(op->op_count, max_sge);
 
 	work_alloc = rds_ib_ring_alloc(&ic->i_send_ring, i, &pos);
 	if (work_alloc != i) {

net/rds/message.c

@@ -341,7 +341,7 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in
 {
 	struct rds_message *rm;
 	unsigned int i;
-	int num_sgs = ceil(total_len, PAGE_SIZE);
+	int num_sgs = DIV_ROUND_UP(total_len, PAGE_SIZE);
 	int extra_bytes = num_sgs * sizeof(struct scatterlist);
 	int ret;
 
@@ -351,7 +351,7 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in
 
 	set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
 	rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
-	rm->data.op_nents = ceil(total_len, PAGE_SIZE);
+	rm->data.op_nents = DIV_ROUND_UP(total_len, PAGE_SIZE);
 	rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs, &ret);
 	if (!rm->data.op_sg) {
 		rds_message_put(rm);

net/rds/rds.h

@@ -48,10 +48,6 @@ void rdsdebug(char *fmt, ...)
 }
 #endif
 
-/* XXX is there one of these somewhere? */
-#define ceil(x, y) \
-	({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
-
 #define RDS_FRAG_SHIFT	12
 #define RDS_FRAG_SIZE	((unsigned int)(1 << RDS_FRAG_SHIFT))
 

net/rds/send.c

@@ -1107,7 +1107,7 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
 	size_t total_payload_len = payload_len, rdma_payload_len = 0;
 	bool zcopy = ((msg->msg_flags & MSG_ZEROCOPY) &&
 		      sock_flag(rds_rs_to_sk(rs), SOCK_ZEROCOPY));
-	int num_sgs = ceil(payload_len, PAGE_SIZE);
+	int num_sgs = DIV_ROUND_UP(payload_len, PAGE_SIZE);
 	int namelen;
 	struct rds_iov_vector_arr vct;
 	int ind;