Re: [PATCH v12 03/12] scs: add support for stack usage debugging

[Sami Tolvanen]

On Wed, Apr 22, 2020 at 06:46:02PM +0100, Will Deacon wrote:
> > +static void scs_check_usage(struct task_struct *tsk)
> > +{
> > +	static unsigned long highest;
> > +	unsigned long used = __scs_used(tsk);
> > +	unsigned long prev;
> > +	unsigned long curr = highest;
> > +
> > +	while (used > curr) {
> > +		prev = cmpxchg(&highest, curr, used);
> 
> I think this can be cmpxchg_relaxed(), since we don't care about ordering
> here afaict.

Sure, I'll change this in v13. Thanks.

Sami