Re: [PATCH V2 1/4] x86/resctrl: Use IPI instead of task_work_add() to update PQR_ASSOC MSR

[Reinette Chatre <reinette.chatre@xxxxxxxxx>]

Hi Borislav,

On 1/6/2021 3:19 AM, Borislav Petkov wrote:
> On Thu, Dec 17, 2020 at 02:31:18PM -0800, Reinette Chatre wrote:
> > +#ifdef CONFIG_SMP
> > +static void update_task_closid_rmid(struct task_struct *t)
> > +{
> > +	if (task_curr(t))
> > +		smp_call_function_single(task_cpu(t), _update_task_closid_rmid,
> > +					 t, 1);
> >   }
> > +#else
> > +static void update_task_closid_rmid(struct task_struct *t)
> > +{
> > +	_update_task_closid_rmid(t);
> > +}
> > +#endif
>
> Why the ifdeffery? Why not simply:
>
> static void update_task_closid_rmid(struct task_struct *t)
> {
>          if (IS_ENABLED(CONFIG_SMP) && task_curr(t))
>                  smp_call_function_single(task_cpu(t), _update_task_closid_rmid, t, 1);
>          else
>                  _update_task_closid_rmid(t);
> }
>
> ?
>
> If no particular reason, I'll change it before committing.

There is no particular reason. What you propose is much more readable.
Thank you very much.

Reinette