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    In the section 'ACCESSING ANOTHER TASK'S CREDENTIALS', the file
    Documentation/credentials.txt says:

    > A function need not get RCU read lock to use __task_cred() if it is holding a
    > spinlock at the time as this implicitly holds the RCU read lock.

    AIUI, that is not actually right any more, is it? A spinlock does not
    suffice as it does not necessarily imply an RCU read-side critical section
    (anymore). Of course the spinlock specifically protecting updates would
    suffice, but that's not what this is saying.

    Am I way off base?


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