Re: [PATCH [RT] 05/14] rearrange rt_spin_lock sleep

[Steven Rostedt]

Gregory,

I guess we should have just read Documentation/memory-barriers.text

Here's the snippet:


Any atomic operation that modifies some state in memory and returns
information
about the state (old or new) implies an SMP-conditional general memory
barrier
(smp_mb()) on each side of the actual operation (with the exception of
explicit lock operations, described later).  These include:

        xchg();
        cmpxchg();
        atomic_cmpxchg();
        atomic_inc_return();
        atomic_dec_return();
        atomic_add_return();
        atomic_sub_return();
        atomic_inc_and_test();
        atomic_dec_and_test();
        atomic_sub_and_test();
        atomic_add_negative();
        atomic_add_unless();
        test_and_set_bit();
        test_and_clear_bit();
        test_and_change_bit();


-- Steve

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