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author | David S. Miller <davem@davemloft.net> | 2009-07-17 03:21:24 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2009-07-17 03:21:24 (GMT) |
commit | da8120355e80ddaf534adb8ed910871d97512d56 (patch) | |
tree | 9958a6c33e29b5af5faccf6650e98729151618a2 /Documentation | |
parent | c86ae82605ef92594a0de809a8c588ae955fed63 (diff) | |
parent | 7fefe6a88494b00b151b5ca7bb84daaa781bbca7 (diff) | |
download | linux-da8120355e80ddaf534adb8ed910871d97512d56.tar.xz |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts:
drivers/net/wireless/orinoco/main.c
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/RCU/rculist_nulls.txt | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/RCU/rculist_nulls.txt b/Documentation/RCU/rculist_nulls.txt index 93cb28d..18f9651 100644 --- a/Documentation/RCU/rculist_nulls.txt +++ b/Documentation/RCU/rculist_nulls.txt @@ -83,11 +83,12 @@ not detect it missed following items in original chain. obj = kmem_cache_alloc(...); lock_chain(); // typically a spin_lock() obj->key = key; -atomic_inc(&obj->refcnt); /* * we need to make sure obj->key is updated before obj->next + * or obj->refcnt */ smp_wmb(); +atomic_set(&obj->refcnt, 1); hlist_add_head_rcu(&obj->obj_node, list); unlock_chain(); // typically a spin_unlock() @@ -159,6 +160,10 @@ out: obj = kmem_cache_alloc(cachep); lock_chain(); // typically a spin_lock() obj->key = key; +/* + * changes to obj->key must be visible before refcnt one + */ +smp_wmb(); atomic_set(&obj->refcnt, 1); /* * insert obj in RCU way (readers might be traversing chain) |