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    rcu: Move lockless_dereference() out of rcupdate.h · 0a04b016
    Peter Zijlstra 提交于
    I want to use lockless_dereference() from seqlock.h, which would mean
    including rcupdate.h from it, however rcupdate.h already includes
    seqlock.h.
    
    Avoid this by moving lockless_dereference() into compiler.h. This is
    somewhat tricky since it uses smp_read_barrier_depends() which isn't
    available there, but its a CPP macro so we can get away with it.
    
    The alternative would be moving it into asm/barrier.h, but that would
    be updating each arch (I can do if people feel that is more
    appropriate).
    
    Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
    Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
    Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
    0a04b016
rcupdate.h 42.3 KB