Re: [PATCH 4/4] locking: Introduce smp_cond_acquire()

[David Howells]

Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> > +       smp_read_barrier_depends(); /* ctrl */  \
> > +       smp_rmb(); /* ctrl + rmb := acquire */  \

Doesn't smp_rmb() imply an smp_read_barrier_depends() anyway?  In
memory-barriers.txt, it says:

     Read memory barriers imply data dependency barriers, and so can
     substitute for them.

David
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