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[PATCH] RCU Documentation fix
Updater should use _rcu variant of list_del(). Signed-off-by: Urs Thuermann <urs@isnogud.escape.de> Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -687,8 +687,9 @@ diff shows how closely related RCU and reader-writer locking can be.
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+ spin_lock(&listmutex);
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list_for_each_entry(p, head, lp) {
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if (p->key == key) {
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list_del(&p->list);
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- list_del(&p->list);
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- write_unlock(&listmutex);
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+ list_del_rcu(&p->list);
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+ spin_unlock(&listmutex);
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+ synchronize_rcu();
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kfree(p);
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@ -736,7 +737,7 @@ Or, for those who prefer a side-by-side listing:
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5 write_lock(&listmutex); 5 spin_lock(&listmutex);
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6 list_for_each_entry(p, head, lp) { 6 list_for_each_entry(p, head, lp) {
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7 if (p->key == key) { 7 if (p->key == key) {
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8 list_del(&p->list); 8 list_del(&p->list);
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8 list_del(&p->list); 8 list_del_rcu(&p->list);
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9 write_unlock(&listmutex); 9 spin_unlock(&listmutex);
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10 synchronize_rcu();
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10 kfree(p); 11 kfree(p);
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