On Fri, Dec 11 2020 at 14:19, David Laight wrote:
> From: Thomas Gleixner
>> You can't catch that. If this really becomes an issue you need a
>> sequence counter around it.
>
> Or just two copies of the high word.
> Provided the accesses are sequenced:
> writer:
> load high:low
> add small_value,high:low
> store high
> store low
> store high_copy
> reader:
> load high_copy
> load low
> load high
> if (high != high_copy)
> low = 0;
And low = 0 is solving what? You need to loop back and retry until it's
consistent and then it's nothing else than an open coded sequence count.
Thanks,
tglx
