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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-04-09 15:39:10 -0700
committerIngo Molnar <mingo@elte.hu>2010-04-14 12:19:51 +0200
commitb62730baea32f86fe91a7930e4b7ee8d82778b79 (patch)
tree97910bcb8a0790b10ff687dad901e158a2da63f4 /Documentation
parent2ba3abd8186f24c7fb418927025b4e2120e3a362 (diff)
downloadlinux-linaro-stable-b62730baea32f86fe91a7930e4b7ee8d82778b79.tar.gz
rcu: Add rcu_access_pointer and rcu_dereference_protected
This patch adds variants of rcu_dereference() that handle situations where the RCU-protected data structure cannot change, perhaps due to our holding the update-side lock, or where the RCU-protected pointer is only to be fetched, not dereferenced. These are needed due to some performance concerns with using rcu_dereference() where it is not required, aside from the need for lockdep/sparse checking. The new rcu_access_pointer() primitive is for the case where the pointer is be fetch and not dereferenced. This primitive may be used without protection, RCU or otherwise, due to the fact that it uses ACCESS_ONCE(). The new rcu_dereference_protected() primitive is for the case where updates are prevented, for example, due to holding the update-side lock. This primitive does neither ACCESS_ONCE() nor smp_read_barrier_depends(), so can only be used when updates are somehow prevented. Suggested-by: David Howells <dhowells@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com Cc: eric.dumazet@gmail.com LKML-Reference: <1270852752-25278-1-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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