[PATCH v2 02/20] documentation: Clarify failed cmpxchg memory ordering semantics

[Catalin Marinas]

On Fri, Jul 24, 2015 at 11:41:53AM +0100, Will Deacon wrote:
> A failed cmpxchg does not provide any memory ordering guarantees, a
> property that is used to optimise the cmpxchg implementations on Alpha,
> PowerPC and arm64.
> 
> This patch updates atomic_ops.txt and memory-barriers.txt to reflect
> this.
> 
> Cc: Peter Zijlstra <peterz at infradead.org>
> Signed-off-by: Will Deacon <will.deacon at arm.com>

Acked-by: Catalin Marinas <catalin.marinas at arm.com>