ksmbd: replace BUFFER_NR_PAGES with inline function

Replace BUFFER_NR_PAGES with inline function
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/ksmbd/transport_rdma.c

@@ -204,9 +204,11 @@ struct smb_direct_rdma_rw_msg {
 	struct scatterlist	sg_list[0];
 };
 
-#define BUFFER_NR_PAGES(buf, len)					\
-		(DIV_ROUND_UP((unsigned long)(buf) + (len), PAGE_SIZE)	\
-			- (unsigned long)(buf) / PAGE_SIZE)
+static inline int get_buf_page_count(void *buf, int size)
+{
+	return DIV_ROUND_UP((uintptr_t)buf + size, PAGE_SIZE) -
+		(uintptr_t)buf / PAGE_SIZE;
+}
 
 static void smb_direct_destroy_pools(struct smb_direct_transport *transport);
 static void smb_direct_post_recv_credits(struct work_struct *work);
@@ -1048,7 +1050,7 @@ static int get_sg_list(void *buf, int size, struct scatterlist *sg_list, int nen
 	int offset, len;
 	int i = 0;
 
-	if (nentries < BUFFER_NR_PAGES(buf, size))
+	if (nentries < get_buf_page_count(buf, size))
 		return -EINVAL;
 
 	offset = offset_in_page(buf);
@@ -1338,7 +1340,7 @@ static int smb_direct_rdma_xmit(struct smb_direct_transport *t, void *buf,
 
 	msg->sgt.sgl = &msg->sg_list[0];
 	ret = sg_alloc_table_chained(&msg->sgt,
-				     BUFFER_NR_PAGES(buf, buf_len),
+				     get_buf_page_count(buf, buf_len),
 				     msg->sg_list, SG_CHUNK_SIZE);
 	if (ret) {
 		atomic_inc(&t->rw_avail_ops);
@@ -1353,7 +1355,7 @@ static int smb_direct_rdma_xmit(struct smb_direct_transport *t, void *buf,
 	}
 
 	ret = rdma_rw_ctx_init(&msg->rw_ctx, t->qp, t->qp->port,
-			       msg->sg_list, BUFFER_NR_PAGES(buf, buf_len),
+			       msg->sg_list, get_buf_page_count(buf, buf_len),
 			       0, remote_offset, remote_key,
 			       is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
 	if (ret < 0) {