Re: linux-next: build failure after merge of the xarray tree

Matthew Wilcox
2019-03-11T02:44:41Z

On Thu, Feb 21, 2019 at 12:34:42PM +0000, Leon Romanovsky wrote:
> On Thu, Feb 21, 2019 at 05:13:32PM +1100, Stephen Rothwell wrote:
> > Hi all,
> >
> > After merging the xarray tree, today's linux-next build (powerpc
> > ppc64_defconfig) failed like this:

[API change]

So I ended up being really busy last week and not having time to send
my merge request for XArray yet. I'm going to send a request this week;
Leon and Jason, how does this merge resolution look?

Compile tested only.

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index a9f29156e486..8a93c0c95953 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -668,19 +668,10 @@ static int assign_name(struct ib_device *device, const char *name)
}
strlcpy(device->name, dev_name(&device->dev), IB_DEVICE_NAME_MAX);

- /* Cyclically allocate a user visible ID for the device */
- device->index = last_id;
- ret = xa_alloc(&devices, &device->index, INT_MAX, device, GFP_KERNEL);
- if (ret == -ENOSPC) {
- device->index = 0;
- ret = xa_alloc(&devices, &device->index, INT_MAX, device,
- GFP_KERNEL);
- }
- if (ret)
- goto out;
- last_id = device->index + 1;
-
- ret = 0;
+ ret = xa_alloc_cyclic(&devices, &device->index, device, xa_limit_31b,
+ &last_id, GFP_KERNEL);
+ if (ret > 0)
+ ret = 0;

out:
up_write(&devices_rwsem);
@@ -1059,14 +1050,14 @@ static int assign_client_id(struct ib_client *client)
* to get the LIFO order. The extra linked list can go away if xarray
* learns to reverse iterate.
*/
- if (list_empty(&client_list))
+ if (list_empty(&client_list)) {
client->client_id = 0;
- else
- client->client_id =
- list_last_entry(&client_list, struct ib_client, list)
- ->client_id;
- ret = xa_alloc(&clients, &client->client_id, INT_MAX, client,
- GFP_KERNEL);
+ } else {
+ struct ib_client *last = list_last_entry(&client_list,
+ struct ib_client, list);
+ client->client_id = last->client_id + 1;
+ }
+ ret = xa_insert(&clients, client->client_id, client, GFP_KERNEL);
if (ret)
goto out;

diff --git a/drivers/infiniband/core/restrack.c b/drivers/infiniband/core/restrack.c
index fa804093fafb..3b5ff2f7b5f8 100644
--- a/drivers/infiniband/core/restrack.c
+++ b/drivers/infiniband/core/restrack.c
@@ -13,28 +13,6 @@
#include "cma_priv.h"
#include "restrack.h"

-static int rt_xa_alloc_cyclic(struct xarray *xa, u32 *id, void *entry,
- u32 *next)
-{
- int err;
-
- *id = *next;
- if (*next == U32_MAX)
- *id = 0;
-
- xa_lock(xa);
- err = __xa_alloc(xa, id, U32_MAX, entry, GFP_KERNEL);
- if (err && *next != U32_MAX) {
- *id = 0;
- err = __xa_alloc(xa, id, *next, entry, GFP_KERNEL);
- }
-
- if (!err)
- *next = *id + 1;
- xa_unlock(xa);
- return err;
-}
-
/**
* rdma_restrack_init() - initialize and allocate resource tracking
* @dev: IB device
@@ -226,7 +204,8 @@ static void rdma_restrack_add(struct rdma_restrack_entry *res)
kref_init(&res->kref);
init_completion(&res->comp);
if (res->type != RDMA_RESTRACK_QP)
- ret = rt_xa_alloc_cyclic(&rt->xa, &res->id, res, &rt->next_id);
+ ret = xa_alloc_cyclic(&rt->xa, &res->id, res, xa_limit_32b,
+ &rt->next_id, GFP_KERNEL);
else {
/* Special case to ensure that LQPN points to right QP */
struct ib_qp *qp = container_of(res, struct ib_qp, res);