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

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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>
This commit is contained in:
Pavel Emelyanov 2007-11-07 02:23:38 -08:00 committed by David S. Miller
parent 4999f3621f
commit b733c007ed
1 changed files with 41 additions and 30 deletions
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69
net/core/sock.c
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@ -1819,23 +1819,48 @@ static int inuse_get(const struct proto *prot)
res += per_cpu_ptr(prot->inuse_ptr, cpu)[0];
return res;
}
static int inuse_init(struct proto *prot)
{
if (!prot->inuse_getval || !prot->inuse_add) {
prot->inuse_ptr = alloc_percpu(int);
if (prot->inuse_ptr == NULL)
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;
int rc = -ENOBUFS;
#ifdef CONFIG_SMP
if (!prot->inuse_getval || !prot->inuse_add) {
prot->inuse_ptr = alloc_percpu(int);
if (prot->inuse_ptr == NULL)
if (inuse_init(prot))
goto out;
prot->inuse_getval = inuse_get;
prot->inuse_add = inuse_add;
}
#endif
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;