Re: [PATCH] ipc/msg: Implement lockless pipelined wakeups

From: Davidlohr Bueso
Date: Sat Oct 31 2015 - 15:07:29 EST

On Sat, 31 Oct 2015, Bueso wrote:

Yes, and this confirms that we still rely on the implicit barrier
from the cmpxchg as tglx mentioned. As such, we also need to keep
the pairing when reading 'r_msg' in do_msgrcv(), instead of dropping
the comments.

Hmm having r_msg as volatile seems even less needed now, we should
drop it. I imagine it was there initially for the busy-wait on the variable
becoming non-nil, but we had cpu_relax _anyway_, so ...
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