[PATCH v4 08/48] xenbus/backend: dynamically allocate the xen-backend shrinker

[Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>]

Use new APIs to dynamically allocate the xen-backend shrinker.

Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
---
 drivers/xen/xenbus/xenbus_probe_backend.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/xen/xenbus/xenbus_probe_backend.c 
b/drivers/xen/xenbus/xenbus_probe_backend.c
index da96c260e26b..929c41a5ccee 100644
--- a/drivers/xen/xenbus/xenbus_probe_backend.c
+++ b/drivers/xen/xenbus/xenbus_probe_backend.c
@@ -284,13 +284,9 @@ static unsigned long backend_shrink_memory_count(struct 
shrinker *shrinker,
        return 0;
 }
 
-static struct shrinker backend_memory_shrinker = {
-       .count_objects = backend_shrink_memory_count,
-       .seeks = DEFAULT_SEEKS,
-};
-
 static int __init xenbus_probe_backend_init(void)
 {
+       struct shrinker *backend_memory_shrinker;
        static struct notifier_block xenstore_notifier = {
                .notifier_call = backend_probe_and_watch
        };
@@ -305,8 +301,16 @@ static int __init xenbus_probe_backend_init(void)
 
        register_xenstore_notifier(&xenstore_notifier);
 
-       if (register_shrinker(&backend_memory_shrinker, "xen-backend"))
-               pr_warn("shrinker registration failed\n");
+       backend_memory_shrinker = shrinker_alloc(0, "xen-backend");
+       if (!backend_memory_shrinker) {
+               pr_warn("shrinker allocation failed\n");
+               return 0;
+       }
+
+       backend_memory_shrinker->count_objects = backend_shrink_memory_count;
+       backend_memory_shrinker->seeks = DEFAULT_SEEKS;
+
+       shrinker_register(backend_memory_shrinker);
 
        return 0;
 }
-- 
2.30.2