Messages in this thread | | | Subject | Re: [PATCH] Document Linux's memory barriers [try #4] | From | (Eric W. Biederman) | Date | Sun, 12 Mar 2006 10:15:20 -0700 |
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A small nit. You are not documenting the most subtle memory barrier: smp_read_barrier_depends(); Which is a deep requirement of the RCU code.
As I understand it. On some architectures (alpha) without at least this a load from a pointer can load from the an old pointer value.
At one point it was suggested this be called: read_memory_barrier_data_dependent().
Simply calling: rcu_dereference is what all users should call but the semantics should be documented at least so that people porting Linux can have a chance of getting it right.
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