[PATCH] arm64: Make icache detection a cpu capability

[Will Deacon]

On Tue, Dec 05, 2023 at 01:31:48PM +0000, Marc Zyngier wrote:
> Now that we only have two icache policies, we are in a good position
> to make the whole detection business more robust.
> 
> Let's replace __icache_flags by a single capability (ICACHE_PIPT),
> and use this if all CPUs are indeed PIPT. It means we can rely on
> existing logic to mandate that a VIPT CPU coming up late will be
> denied booting, which is the safe thing to do.

Why do we want to prevent that? We currently allow it and I'm not seeing
what goes wrong.

Will