On Fri, Nov 24, 2023 at 04:34:50PM +0000, Joey Gouly wrote:
> @@ -498,6 +508,17 @@ static void erratum_1418040_new_exec(void)
> preempt_enable();
> }
>
> +static void permission_overlay_switch(struct task_struct *next)
> +{
> + if (system_supports_poe()) {
> + current->thread.por_el0 = read_sysreg_s(SYS_POR_EL0);
> + if (current->thread.por_el0 != next->thread.por_el0) {
> + write_sysreg_s(next->thread.por_el0, SYS_POR_EL0);
> + isb();
> + }
> + }
Nitpick: use "if (!system_supports_poe()) return;" to avoid too much
indentation.
W.r.t. the isb(), I think we accumulated quite a lot on this path. It
might be worth going through them and having one at the end, where
possible.
--
Catalin
