Re: [PATCH 7/8] locking: Use [READ,ASSIGN]_ONCE() for non-scalar types

From: Peter Zijlstra
Date: Sun Dec 28 2014 - 11:38:20 EST

On Sun, Dec 28, 2014 at 01:11:22AM -0800, Davidlohr Bueso wrote:
> I guess everyone will eventually have to update, so lets
> do our part... and become the first users of ASSIGN_ONCE().

> - ACCESS_ONCE(prev->next) = node;
> + ASSIGN_ONCE(node, prev->next);

> - struct mcs_spinlock *next = ACCESS_ONCE(node->next);
> + struct mcs_spinlock *next = READ_ONCE(node->next);

That's disgusting and sad, doubly so because I was entirely unaware of that stuff.
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