In the Linux kernel, list_for_each_entry_rcu() is used to traverse rcu protected list in reader side critical section. What happens if list_for_each_entry() is used instead? Does it cause problems?
Does using list_for_each_entry() in rcu reader side critical section cause problems?
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In some architectures CPUs can look through the next pointer early. Specially in case of ALPHA and SPARC CPUs. Hence
list_for_each_entry_rcu()is needed which essentially put memory barriers to limit this behavior. However in writer side we can avoidlist_for_each_entry_rcu()and uselist_for_each_entry().