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SubjectReiser4 with 2.6.15-rc5-rt4

it is possible to to patch the reiser4 code into 2.6.15-rc5-rt4, but
rcu_barrier() is only available within the #ifndef CONFIG_PREEMPT_RCU block
in kernel/rcupdate.c. However, if one has CONFIG_PREEMPT_RT=y, then
CONFIG_PREEMPT_RCU=y, and hence no rcu_barrier() and the other two
functions are available.
Does anyone have a patch that adds a rcu_barrier() and friends to the

Jan Engelhardt
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