staging: lustre: Using macro DIV_ROUND_UP

The macro DIV_ROUND_UP performs the computation (((n) + (d) - 1) /(d)).
It clarifies the divisor calculations. This occurence was detected using
the coccinelle script:

@@
expression e1;
expression e2;
@@
(
- ((e1) + e2 - 1) / (e2)
+ DIV_ROUND_UP(e1,e2)
|
- ((e1) + (e2 - 1)) / (e2)
+ DIV_ROUND_UP(e1,e2)
)

Signed-off-by: simran singhal <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c

···
 	tpo->tpo_tx_descs = NULL;
 	tpo->tpo_tx_pages = NULL;
 
-	npg = (size * IBLND_MSG_SIZE + PAGE_SIZE - 1) / PAGE_SIZE;
+	npg = DIV_ROUND_UP(size * IBLND_MSG_SIZE, PAGE_SIZE);
 	if (kiblnd_alloc_pages(&tpo->tpo_tx_pages, ps->ps_cpt, npg)) {
 		CERROR("Can't allocate tx pages: %d\n", npg);
 		LIBCFS_FREE(tpo, sizeof(*tpo));

drivers/staging/lustre/lnet/selftest/conrpc.c

···
 	struct test_bulk_req *brq = &req->tsr_u.bulk_v0;
 
 	brq->blk_opc = param->blk_opc;
-	brq->blk_npg = (param->blk_size + PAGE_SIZE - 1) /
-			PAGE_SIZE;
+	brq->blk_npg = DIV_ROUND_UP(param->blk_size, PAGE_SIZE);
 	brq->blk_flags = param->blk_flags;
 
 	return 0;
···
 	trq = &(*crpc)->crp_rpc->crpc_reqstmsg.msg_body.tes_reqst;
 
 	if (transop == LST_TRANS_TSBSRVADD) {
-		int ndist = (sgrp->grp_nnode + test->tes_dist - 1) /
-			    test->tes_dist;
-		int nspan = (dgrp->grp_nnode + test->tes_span - 1) /
-			    test->tes_span;
-		int nmax = (ndist + nspan - 1) / nspan;
+		int ndist = DIV_ROUND_UP(sgrp->grp_nnode, test->tes_dist);
+		int nspan = DIV_ROUND_UP(dgrp->grp_nnode, test->tes_span);
+		int nmax = DIV_ROUND_UP(ndist, nspan);
 
 		trq->tsr_ndest = 0;
 		trq->tsr_loop = nmax * test->tes_dist * test->tes_concur;

drivers/staging/lustre/lustre/ptlrpc/client.c

···
 	 * that server can infer the number of bulks that were prepared,
 	 * see LU-1431
 	 */
-	req->rq_mbits += ((bd->bd_iov_count + LNET_MAX_IOV - 1) /
-			  LNET_MAX_IOV) - 1;
+	req->rq_mbits += DIV_ROUND_UP(bd->bd_iov_count, LNET_MAX_IOV) - 1;
 }
 
 /**

drivers/staging/lustre/lustre/ptlrpc/niobuf.c

···
 	LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback);
 	LASSERT(desc->bd_cbid.cbid_arg == desc);
 
-	total_md = (desc->bd_iov_count + LNET_MAX_IOV - 1) / LNET_MAX_IOV;
+	total_md = DIV_ROUND_UP(desc->bd_iov_count, LNET_MAX_IOV);
 	/* rq_mbits is matchbits of the final bulk */
 	mbits = req->rq_mbits - total_md + 1;
 

drivers/staging/lustre/lustre/ptlrpc/sec_bulk.c

···
 static inline
 int npages_to_npools(unsigned long npages)
 {
-	return (int)((npages + PAGES_PER_POOL - 1) / PAGES_PER_POOL);
+	return (int)DIV_ROUND_UP(npages, PAGES_PER_POOL);
 }
 
 /*