Re: [PATCH] alpha: add barrier before writing to the hae register

[Richard Henderson]

On 08/22/2018 01:42 PM, Mikulas Patocka wrote:
>       unsigned long flags = swpipl(IPL_MAX);
>  
> -     barrier();
> +     mb();

Maybe, but I doubt it makes a difference in practice.

The swpipl is a transition through PALcode, and the
instruction queue will have been flushed into and out
of PALmode.

But of course the barrier shouldn't be required either.


r~