Messages in this thread | | | Subject | Re: Sleeping in RCU list traversal | From | Tetsuo Handa <> | Date | Sun, 7 Oct 2007 22:26:23 +0900 |
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Hello.
Thank you for pointing out.
Jun WANG wrote: > >rcu_read_lock(); > >list_for_each_rcu(p, ...) { > > ptr = list_entry(p, struct ..., list); > > /* Grab a reference to "ptr". */ > > rcu_read_unlock(); > > my_task_that_may_sleep(ptr); > > rcu_read_lock(); > > /* Drop a reference to "ptr". */ > > } > > rcu_read_unlock(); > > In Document/RCU/whatisRCU.txt > Note that the value returned by rcu_dereference() is valid > only within the enclosing RCU read-side critical section. Excuse me, but I think "p" is used only between rcu_read_lock() and rcu_read_unlock(). Is it illegal to use "ptr" after rcu_read_unlock() if "ptr" is obtained before rcu_read_unlock() ?
Regards.
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