Re: [PATCH v6] arm64: Add support for new control bits CTR_EL0.DIC and CTR_EL0.IDC

[Will Deacon]

On Tue, Mar 06, 2018 at 01:33:00PM -0600, Shanker Donthineni wrote:
> > I also confirmed with Thomas Speier, we can skip __flush_icache_all() if 
> > DIC=1.

Thanks,

> Planning to patch __flush_icache_all() itself instead of changing the 
> callers. This
> way we can avoid "ic ialluis" completely. Is this okay for you? 
> 
> static inline void __flush_icache_all(void)
> {
>        /* Instruction cache invalidation is not required for I/D coherence? */
>       if (!cpus_have_const_cap(ARM64_HAS_CACHE_DIC)) {
>                asm("ic ialluis");
>                dsb(ish);
>        }
> }

Yup, that's what I meant, cheers.

Will