[PATCH v1] rds: use DIV_ROUND_UP instead of ceil

[Jacob Wen]

Yes indeed, DIV_ROUND_UP is in kernel.h.

Signed-off-by: Jacob Wen <jian.w....@oracle.com>
---
v1
- git rebase

---
 net/rds/ib_send.c | 4 ++--
 net/rds/message.c | 4 ++--
 net/rds/rds.h     | 4 ----
 net/rds/send.c    | 2 +-
 4 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/net/rds/ib_send.c b/net/rds/ib_send.c
index 2dcb555e6350..4e0c36acf866 100644
--- a/net/rds/ib_send.c
+++ b/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) {
diff --git a/net/rds/message.c b/net/rds/message.c
index f139420ba1f6..50f13f1d4ae0 100644
--- a/net/rds/message.c
+++ b/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);
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 02ec4a3b2799..4ffe100ff5e6 100644
--- a/net/rds/rds.h
+++ b/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))
 
diff --git a/net/rds/send.c b/net/rds/send.c
index 3d822bad7de9..fd8b687d5c05 100644
--- a/net/rds/send.c
+++ b/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;
-- 
2.17.1