kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

sysctl,rcu: Convert call_rcu(free_head) to kfree

Browse source 
The RCU callback free_head just calls kfree(), so we can use kfree_rcu()
instead of call_rcu().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2011-05-01 23:21:00 -07:00
parent 22a3c7d188
commit a95cded32d
1 changed files with 3 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
kernel/sysctl.c
View file

@ -1590,16 +1590,11 @@ void sysctl_head_get(struct ctl_table_header *head)
spin_unlock(&sysctl_lock);
}
static void free_head(struct rcu_head *rcu)
{
kfree(container_of(rcu, struct ctl_table_header, rcu));
}
void sysctl_head_put(struct ctl_table_header *head)
{
spin_lock(&sysctl_lock);
if (!--head->count)
call_rcu(&head->rcu, free_head);
kfree_rcu(head, rcu);
spin_unlock(&sysctl_lock);
}
@ -1971,10 +1966,10 @@ void unregister_sysctl_table(struct ctl_table_header * header)
start_unregistering(header);
if (!--header->parent->count) {
WARN_ON(1);
call_rcu(&header->parent->rcu, free_head);
kfree_rcu(header->parent, rcu);
}
if (!--header->count)
call_rcu(&header->rcu, free_head);
kfree_rcu(header, rcu);
spin_unlock(&sysctl_lock);
}