Re: [PATCH v6 1/9] eal: generic 64 bit counter

[Stephen Hemminger <stephen@networkplumber.org>]

On Fri, 17 May 2024 02:45:12 +0000
Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com> wrote:

> > + * A counter is 64 bit value that is safe from split read/write
> > + * on 32 bit platforms. It assumes that only one cpu at a time  
> If we are defining the counter in this manner, then implementation cannot be generic. I think architectures will have constraints if they have to ensure the 64b variables are not split.
> 
> I think we at least need the counter to be aligned on 8B boundary to have generic code.

The C standard has always guaranteed that read and write to unsigned log will not be split.
Therefore if arch is 64 bit native there is no need for atomics