[NET]: Clean proto_(un)register from in-code ifdefs

The struct proto has the per-cpu "inuse" counter, which is handled
with a special care. All the handling code hides under the ifdef
CONFIG_SMP and it introduces some code duplication and makes it
look worse than it could.

Clean this.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/sock.c b/net/core/sock.c
index e077f26..8fc2f84 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1819,23 +1819,48 @@ static int inuse_get(const struct proto *prot)
                res += per_cpu_ptr(prot->inuse_ptr, cpu)[0];
        return res;
 }
-#endif
 
-int proto_register(struct proto *prot, int alloc_slab)
+static int inuse_init(struct proto *prot)
 {
-       char *request_sock_slab_name = NULL;
-       char *timewait_sock_slab_name;
-       int rc = -ENOBUFS;
-
-#ifdef CONFIG_SMP
        if (!prot->inuse_getval || !prot->inuse_add) {
                prot->inuse_ptr = alloc_percpu(int);
                if (prot->inuse_ptr == NULL)
-                       goto out;
+                       return -ENOBUFS;
+
                prot->inuse_getval = inuse_get;
                prot->inuse_add = inuse_add;
        }
+       return 0;
+}
+
+static void inuse_fini(struct proto *prot)
+{
+       if (prot->inuse_ptr != NULL) {
+               free_percpu(prot->inuse_ptr);
+               prot->inuse_ptr = NULL;
+               prot->inuse_getval = NULL;
+               prot->inuse_add = NULL;
+       }
+}
+#else
+static inline int inuse_init(struct proto *prot)
+{
+       return 0;
+}
+
+static inline void inuse_fini(struct proto *prot)
+{
+}
 #endif
+
+int proto_register(struct proto *prot, int alloc_slab)
+{
+       char *request_sock_slab_name = NULL;
+       char *timewait_sock_slab_name;
+
+       if (inuse_init(prot))
+               goto out;
+
        if (alloc_slab) {
                prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
                                               SLAB_HWCACHE_ALIGN, NULL);
@@ -1887,9 +1912,8 @@ int proto_register(struct proto *prot, int alloc_slab)
        write_lock(&proto_list_lock);
        list_add(&prot->node, &proto_list);
        write_unlock(&proto_list_lock);
-       rc = 0;
-out:
-       return rc;
+       return 0;
+
 out_free_timewait_sock_slab_name:
        kfree(timewait_sock_slab_name);
 out_free_request_sock_slab:
@@ -1903,15 +1927,9 @@ out_free_sock_slab:
        kmem_cache_destroy(prot->slab);
        prot->slab = NULL;
 out_free_inuse:
-#ifdef CONFIG_SMP
-       if (prot->inuse_ptr != NULL) {
-               free_percpu(prot->inuse_ptr);
-               prot->inuse_ptr = NULL;
-               prot->inuse_getval = NULL;
-               prot->inuse_add = NULL;
-       }
-#endif
-       goto out;
+       inuse_fini(prot);
+out:
+       return -ENOBUFS;
 }
 
 EXPORT_SYMBOL(proto_register);
@@ -1922,14 +1940,7 @@ void proto_unregister(struct proto *prot)
        list_del(&prot->node);
        write_unlock(&proto_list_lock);
 
-#ifdef CONFIG_SMP
-       if (prot->inuse_ptr != NULL) {
-               free_percpu(prot->inuse_ptr);
-               prot->inuse_ptr = NULL;
-               prot->inuse_getval = NULL;
-               prot->inuse_add = NULL;
-       }
-#endif
+       inuse_fini(prot);
        if (prot->slab != NULL) {
                kmem_cache_destroy(prot->slab);
                prot->slab = NULL;