Messages in this thread | | | From | David Howells <> | Subject | Re: [PATCH] NFS: Fix RCU warnings in nfs_inode_return_delegation_noreclaim() [ver #2] | Date | Tue, 06 Apr 2010 20:34:06 +0100 |
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Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:
> OK, just to make sure I understand you... You are asking for two additional > RCU API members: > > 1. rcu_access_pointer() or some such that includes ACCESS_ONCE(), > but not smp_read_barrier_depends(), which may be used when > we are simply examining the value of the RCU-protected pointer > (as in the NFS case). It could also be used when the > appropriate update-side lock is held, but for that we have: > > 2. rcu_dereference_protected() or some such that includes neither > ACCESS_ONCE() nor smp_read_barrier_depends(), and that may > only be used if updates are prevented, for example, by holding > the appropriate update-side lock. > > Does this fit?
Yep. I think so.
David
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