RFC on writel and writel_relaxed
okaya at codeaurora.org
Fri Mar 23 04:51:15 AEDT 2018
On 3/22/2018 8:52 AM, Benjamin Herrenschmidt wrote:
>>> No, it's not sufficient.
> Just to clarify ... barrier() is just a compiler barrier, it means the
> compiler will generate things in the order they are written. This isn't
> sufficient on archs with an OO memory model, where an actual memory
> barrier instruction needs to be emited.
Surprisingly, ARM64 GCC compiler generates a write barrier as
opposed to preventing code reordering.
I was curious if this is an ARM only thing or not.
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