[PATCH 31/32] cma: Convert portspace IDRs to XArray

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
---
 drivers/infiniband/core/cma.c | 44 ++++++++++++++---------------------
 1 file changed, 17 insertions(+), 27 deletions(-)

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 84f077b2b90a..d3fab53eb30b 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -39,7 +39,7 @@
 #include <linux/mutex.h>
 #include <linux/random.h>
 #include <linux/igmp.h>
-#include <linux/idr.h>
+#include <linux/xarray.h>
 #include <linux/inetdevice.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -191,10 +191,10 @@ static struct workqueue_struct *cma_wq;
 static unsigned int cma_pernet_id;
 
 struct cma_pernet {
-	struct idr tcp_ps;
-	struct idr udp_ps;
-	struct idr ipoib_ps;
-	struct idr ib_ps;
+	struct xarray tcp_ps;
+	struct xarray udp_ps;
+	struct xarray ipoib_ps;
+	struct xarray ib_ps;
 };
 
 static struct cma_pernet *cma_pernet(struct net *net)
@@ -202,7 +202,8 @@ static struct cma_pernet *cma_pernet(struct net *net)
 	return net_generic(net, cma_pernet_id);
 }
 
-static struct idr *cma_pernet_idr(struct net *net, enum rdma_ucm_port_space ps)
+static
+struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
 {
 	struct cma_pernet *pernet = cma_pernet(net);
 
@@ -247,25 +248,25 @@ struct class_port_info_context {
 static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
 			struct rdma_bind_list *bind_list, int snum)
 {
-	struct idr *idr = cma_pernet_idr(net, ps);
+	struct xarray *xa = cma_pernet_xa(net, ps);
 
-	return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
+	return xa_insert(xa, snum, bind_list, GFP_KERNEL);
 }
 
 static struct rdma_bind_list *cma_ps_find(struct net *net,
 					  enum rdma_ucm_port_space ps, int snum)
 {
-	struct idr *idr = cma_pernet_idr(net, ps);
+	struct xarray *xa = cma_pernet_xa(net, ps);
 
-	return idr_find(idr, snum);
+	return xa_load(xa, snum);
 }
 
 static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
 			  int snum)
 {
-	struct idr *idr = cma_pernet_idr(net, ps);
+	struct xarray *xa = cma_pernet_xa(net, ps);
 
-	idr_remove(idr, snum);
+	xa_erase(xa, snum);
 }
 
 enum {
@@ -4688,27 +4689,16 @@ static int cma_init_net(struct net *net)
 {
 	struct cma_pernet *pernet = cma_pernet(net);
 
-	idr_init(&pernet->tcp_ps);
-	idr_init(&pernet->udp_ps);
-	idr_init(&pernet->ipoib_ps);
-	idr_init(&pernet->ib_ps);
+	xa_init(&pernet->tcp_ps);
+	xa_init(&pernet->udp_ps);
+	xa_init(&pernet->ipoib_ps);
+	xa_init(&pernet->ib_ps);
 
 	return 0;
 }
 
-static void cma_exit_net(struct net *net)
-{
-	struct cma_pernet *pernet = cma_pernet(net);
-
-	idr_destroy(&pernet->tcp_ps);
-	idr_destroy(&pernet->udp_ps);
-	idr_destroy(&pernet->ipoib_ps);
-	idr_destroy(&pernet->ib_ps);
-}
-
 static struct pernet_operations cma_pernet_operations = {
 	.init = cma_init_net,
-	.exit = cma_exit_net,
 	.id = &cma_pernet_id,
 	.size = sizeof(struct cma_pernet),
 };
-- 
2.20.1