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include/linux/rculist_nulls.h

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 * @head:       the head for your list.

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 * @member:     the name of the hlist_nulls_node within the struct.

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 *

 

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 * The barrier() is needed to make sure compiler doesn't cache first element [1],

 

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 * as this loop can be restarted [2]

 

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 * [1] Documentation/atomic_ops.txt around line 114

 

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 * [2] Documentation/RCU/rculist_nulls.txt around line 146

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 */

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#define hlist_nulls_for_each_entry_rcu(tpos, pos, head, member)                 \

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        for (pos = rcu_dereference_raw(hlist_nulls_first_rcu(head));            \

 

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        for (({barrier();}),                                                    \

 

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             pos = rcu_dereference_raw(hlist_nulls_first_rcu(head));            \

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                (!is_a_nulls(pos)) &&                                           \

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                ({ tpos = hlist_nulls_entry(pos, typeof(*tpos), member); 1; }); \

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                pos = rcu_dereference_raw(hlist_nulls_next_rcu(pos)))

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